Purchasing advice needed for TP2 (Re: eBay)

[Cicatrize]

Alright, here's the thing. I've never purchased a new phone on eBay before, and obviously, with the stuck pixel issues people are reporting, I'm going to want to buy it from someone who has a 30 day return/exchange policy.

The price of the unit on eBay, brand new in box, is about $500-520 right now, and if I do the Buy It Now option, I can get 8% ($40) back with the Bing cashback program instantly into my PayPal (google it if you don't know what it is). So, basically, I'd be getting the phone for $460-$480.

Have you guys waited to buy a phone on eBay after a phone's release? Is this a good time to buy, or can I expect to see a bigger price drop in the near future on this device? IIRC, the TP1 only dropped about $100 in price, just like this, and stayed there for a while, but I don't remember for sure.

Any advice?