Wholesale markets such as Gardener or Lublino would be a good option. Arriving there, you can familiarize yourself with almost any product in detail live. True, to begin with, you will need start-up capital, in the future, if your sales are successfully promoted and you can reach good volumes, then the product will already be trusted to you without payment - for implementation or deferred payment.
In general, in China, if you choose reliable suppliers, it will be cheaper and more convenient to buy. Chinese Ali, Tao and Korean Gmarket provide a huge assortment from small items to large items. It is important to understand who will deal with all the red tape with customs. The easiest way for now is to work through intermediaries such as litemf.com and other Shipitoes. Especially for starting your business, it is more convenient to just keep track of your virtual office and collect consignments of parcels, especially since everyone who is not lazy is already engaged in sea transportation.
I found a great store - the Perekrestok supermarket. All goods and products at very reasonable prices. In addition, they have a bonus card that provides a lot of opportunities and advantages. You can read all the information here: https://myperekrestok.ru/
Where else to buy, from those who make the goods. Here you need to decide what you want to sell and to whom. And then there will be ...
For example, there is a manufacturer of doors in Chelyabinsk http://cheldveri.ru/o-kompanii
I sell people in the news. You choose your option
Everything, of course, depends on what product you need.
China is the absolute leader in this area, here you can find absolutely any product category. Cons - trading in dollars and long delivery. Pros: very cheap (even if it is not a full-fledged wholesale), in the fall China promises to make its own international payment system and it will be possible to trade without a dollar.
Now, more specifically on the sites:
aliexpress .com. This is not wholesale. But still everything is very cheap, a lot of free shipping, there are reviews, when ordering in large quantities, almost all products have discounts, you can also write to the seller personally and agree on a discount for you when ordering a large batch of goods.
alibaba.com. And this is already wholesale, but everything is much more complicated here. You will not buy anything directly from the site, in fact, this is a platform where wholesalers indicate their existence, describe working conditions and show their goods. Prices are lower than on Ali, but there is such a thing as the minimum order. Some products have 10,000 pieces, some 1,000 pieces, you can find wholesale from both 10 and 1 unit of goods, the main thing is to search diligently. If you go to manufacturers or good intermediaries, you can order goods with your own logo, for example, T-shirts with your own prints (most likely it will be cheaper for you than printing in large quantities in your city) or something even cooler and more interesting.
The prices here are individual: you see the product, you like it, you write to the seller about it and talk about which batch of goods you need. He, in turn, tells you the price.
The main disadvantage in comparison with aliexpress is expensive delivery, at the moment delivery to Russia costs almost $ 3 per unit. This is beneficial when the product is sold in boxes (the lot of the product - one, dozen, box, bag, etc. - is indicated on the product page) - you pay three dollars for a box that can contain 10 units. But paying three dollars per unit is often less profitable. Especially if the product itself comes out at $ 1-1.5 per item)
You can also personally go to China to make a purchase with your own hands. I myself have not come across this, but they say that there are special intermediary guides who will help you navigate the Chinese wholesale markets, with manufacturers, contracts, etc. They charge either a fixed amount for their escort, or you pay every hour of their work. There are also intermediaries with whom you can work remotely, they usually take a percentage of the amount of your purchase.
To search for wholesalers in Russia, you can use the wonderful site - tiu.ru
Just select the "wholesale" category when searching for the product you need and browse the products. A large number of local wholesalers have their own "page" on this site. The minimum purchase from them can start from 3,000 and end with 30,000, depending on the receipt, coolness and other factors. Delivery, of course, is not as expensive as from China, but still estimate the distanceb the region of the supplier from your region and calculate the prices through calculators on the website of transport companies in order to clearly see all the costs.
Prices from Russian wholesalers, of course, are higher than in China, and the range is much lower. And if you need to really quickly, then turn your gaze ... to Ukraine.
Yes, you heard right. Ukraine. Odessa. 7 kilometer. The largest market in Europe. Your task is to find an intermediary who will buy there (trust me, at very cheap prices) the goods and send them to you. There you will find far from all groups of goods, you need to clarify about specific categories. But to deal with clothes with them, for example, is very profitable. Delivery to Belgorod, Rostov, Voronezh, Krasnodar usually takes place within 2-5 days, by shopping mall or by bus. Then everything depends on the transport company. But ideally, of course, you need to go there and buy (which became a little problematic after the Ukrainian events)
If you still have questions, you can go to my VK page through my profile and ask them in a personal message)