While anecdotal, I can personally confirm this. my wife LOVES shopping for "the deal" -- it's all a game to her. I tease her a lot because there are countless times where she comes home with widgets that we don't immediately need, but were purchased solely because of their discount %.
For her, something at a low price point to begin with appears cheap, however you take that same item and slap a high MSRP on it with a 50% discount down to that same first price point... now we're talking!
All that you need to do is turn it into a real game by having a website which let's you compete against your friends and strangers for who got the "best deals". Turns it into a game that the retailer is bound to be very happy about.