well I paid $164 at www.newegg.com. My processor is AYHJA and it came to me already unlocked. So far I've overclocked to 1.6 GHz two ways, 145 x 11 and 136 x 11.5 (not exactly 1.6 of coarse)
145 x 11 gives better performance, all I have is an mc370 with a delta fan and I'm right around 52 degrees celsius according to the via hardware monitor (which I don't think is as accurate as the Asus monitoring)
I run rock stable no problems at all, so I'll probably try for 1650 or 1700 MHz, but I might just hold out for a peltier first.
I have an 80mm and 92 mm and a hard drive cooler (three 40mm fans) blowing air into the case, and two 80mm and one 92 mm blowing air out so I'm getting good air flow. With this kind of flow I think I could support a small peltier