Yes I realise that but you can buy them one at a time which is ideal if you are just starting out. Most people cannot afford to buy 100+ from a wholesaler.
Depends on who you buy from and your negotiation skills. My main suppliers allow me to purchase whatever quantity I wish. Originally one of my suppliers tried to tell me they could only sell me 100+ quantity until I convinced them that because of the nature of the product that we should have to build a relationship before I commit to a large order and I've been choosing my quantity ever since. Also, in my experience the ones I find that require a certain quantity have a lower profit margin for the most part unless you purchase 1k+.