Looks like NewEgg has them for $149.99 and up.
You can get most 6850's for $159 after rebate with a PowerColor 6850 going for $149.99.
The 5770 is listed anywhere from $99 to $119 after rebate. There are even overclocked versions of the 5770 going for $119 after rebate.
The 550ti barely beats a 5770 for $30 - $50 more and gets badly beaten by the 6850 for the same or $10 more.
Looks like they will need to adjust the price downward.