I've been keeping tabs on the PS3 auctions on eBay for the last couple days, just out my own curiousity.
On Friday morning, the average price for a PS3 on eBay was around the $2600 mark, although up to $4000 wasn't unheard of. By 5 or 6 PM, the average price had already dropped to the $1500-$1800 mark. Waiting a mere 12 hours could have saved a lot of people well over a thousand dollars.
By this afternoon, the average price was in the $900 to $1200 range (mostly around the lower end of that scale, and with a game in many cases). Auctions with a starting price over $1400 were ending without any bids. The profit margin is shrinking fast, and I think there's going to be a lot of disappointed scalpers out there. It's hard to predict how the Wii launch tomorrow will affect the prices, but I can't imagine it's going to help.