PowerStore does not have functionality to give you different prices for the items based on the user that is logged in. There is a section of the store that works with coupons though that you could use to offer the whole sale discount pricing.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.