Good idea to keep an eye on such things but don't expect a firm answer. It may have to do with what's in the pipe and then newer comes out cheaper and those that sell these are stuck.
I did NOT research the 2 models to see if L2 Cache Sizes were pushing the price around. I'll just note it does.
Can someone explain why the E6750 is cheaper than the E6600, but has higher specs such as the 1333 fsb compatibility?
Intel E6600: $243/2.4 ghz/1066 fsb
Intel E6750: $183/2.66 ghz/ 1333 fsb