need simple internet shop...

I want a internet shop solution/freeware where i can allow people to log in and when apporved they get categorized as Partners, wholesalers or buyers resulting in differnet rebates on the rrp(requested retail price) If approved by me or by first login as "customers/buyers" they only get to see the retail prices in the shop. This shop/solution also have to include either paypal or the like for payment with credit card.