There are several very good eCommerce modules for DNN. Several are open source. I suggest that you do a preliminary search at store.dnnsoftware.com. Should you have any questions about what you find, ask for more help.

Are you looking for lists of Option related to a Product/Service? If so view my 14 Min video at http://www.cpqcart.com/Video Not in the video a Discount % can be set on a User so they will receive a different price.
Lee Hinman

Fraguerr,

I will only talk about free possibilities, there are commercial solutions around that integrate with DNN, but I think before you spend money you should give them a try.

I was using NB Store a while ago, and this was possible with it - you could set up different prizes based on users and/or roles (e.g. end customers, resellers etc.). There were also other rebate possibilities, e.g. coupons etc. I have not tried Open Store (the successor of NB Store) yet, but I don't see any reason why this features should be gone there.
https://github.com/openst...-ecommerce/OpenStore

The other way to implement a store is to create a dedicated store site, e.g. you have a web site called www.something.com, and a store site called store.something.com. I know people in the community here who have realized it this way using nopCommerce (which is a very advanced ecommerce solution based on ASP.Net, and should meet your requirements). As it is also based on ASP.Net, it is easily possible to install it on the same machine, and both DNN and nopCommerce allow to create themes (or skins), therefore both sites may have the same look and feel.
https://www.nopcommerce.com/

Happy DNNing!
Michael