First, from what I have read, the GF4 is not as good as the GF3... but that is based on stats that I read somewhere, so I don't know why they would lower the price on GF3... that is my opinion.
I got my black friday Xtasy GF3 TI200 rebate yesterday. For this rebate only, if you have waited the 8 weeks or whatever the rebate said, then tell them it has been like 10 weeks, and you don't want to wait any longer, and the guy just said "It'll be in the mail tomorrow", and 2 days later, here it was!!