eshop with login

We would need a new OSCommerce eshop or other (open source eshop with admin in French) like this ezclones (with a logo and other colors) - payment by paypal: www ezclones com/store but empty (all products will be entered by the client). Also, it is important that the first page is a "login" page, and in function of the login, all prices of products are either "wholesalers" or "details" (the login "details" should not see prices "wholesalers" and reverse). Can you do this? at what cost? and what is the timing ? Ideal budget would be around $100.- as it quite simple for anyone used to deal with open source eshop Attention : admin must be available in french