There are a couple primary wholesalers. Moteng, and another name I can't dredge up at the moment. (A common affliction w/my memory).
I'd guess you'd have to establish a line of credit, or do your buying with a CC, and pay promptly, etc, to enable purchase in much quantity. Some manufacturers sell directly to merchants, I believe.
No offense, but with just one post, it appears that you could be very new to the world of knives. Then again, you could have been lurking for 10 hours a day for 3 years too.
If, in fact, you're new to the world of knives, and perhaps not too experienced in the business of a small retail business, I'd suggest that you maybe slow down a bit. The first thing you need is a substantial knowledge of your products. A quick study can probably learn enough to be able to answer a majority of questions after a few months here, reading archives as well as current forums, and reading knife books and knife magazines. Could take longer. The reason I say this, is because so many forumites, and unknown lurkers are themselves so knowledgeable about knives, and the knife business.
I'd recommend you get to know your competition before taking them on. I'd spend some time studying the sites of Knife Center, Knife Outlet, Smoky Mountain Knife Works, Bayou LaFourche, Discount Knives, Skylands, and the upscale Knife Art, Blade Art, Arizona Custom Knives, Les Robertson's site, and many others. See if you can find a niche not now occupied, or at least not effectively occupied.
You, of course, could limit yourself to selling on E-bay, or other auctions. That might be a relatively safe way to break in, selling only as you can afford to buy knives. Since so many knives are relatively expensive, I imagine that selling knives is one of those businesses where being able to afford a large inventory makes an extreme amount of ability. People will wait only for great prices, or great service, or both. I know I'd be very reluctant to buy from a seller who didn't stock a popular knife, and had to get it from his/her supplier, before shipping could be possible. Of course, everyone can guess wrong and get caught short, but it is easier to feel confident in well-known, established businesses with good reputations than in somebody you never heard of before.
Golly, am sounding negative tonite, aren't I? Fear I failed to welcome you to the forums. Frankly, haven't before seen a 1st post anything like yours. If, indeed, I've grossly underestimated your knife and/or business experience, I apologize. From the nature of your question, tho, plus the fact it was your first post, it was easy to draw the conclusions that both knives and business could be strangers to you.
If I've offended, I'm sorry. I am the reincarnation of the fellow who jousted with windmills. (another case of blank mind at wrong time) Ah -- Don Quixote. Sorry, but I have to go thru this drill of saying I can't get it before I do. Yes, they'll be taking me away soon, am sure.
------------------
Asi es la vida
Bugs