I don't think the UX is too complicated. Its smart, though somewhat troublesome because its not something your users would be familiar with (bookmarklets?). To

I don't think the UX is too complicated. Its smart, though somewhat troublesome because its not something your users would be familiar with (bookmarklets?). To be clear, its unfamiliar, not complicated. If you're getting the users to install the bookmarklet, they've done the hardest part as far as your implementation goes. IMO, the hard part of the UX is picking a price that you'd pay for it. I love the idea of this app, but that particular aspect can be taxing for those people of us who who are less ambitious/frugal than others. I would put an emphasis on suggesting how to decide on a fair price. Many people don't have any sense of price or negotiation, and could get 'bored' because they don't want to take a second to think about what something is really worth to them--or conversely, they get bored when they start over-thinking about what its really worth to them. On a side note, have you considered adding some sort of price-check input for bidders to report other outlets that offer lower prices? For instance, a seller be more inclined to give a discount if the user can report a lower price elsewhere. This shared information makes both parties better off. this is sort of off topic, so you can disregard it, but i was curious what your thoughts were about the potential for arbitrage, where users of this tool get discounts and resell on somewhere like amazon or ebay.