This actually could represent an all time low for this memory, esp. the 256meg Cas2 PC133 stuff. Here's my theory:
1) We are of course in the 1st quarter, after Xmas / end of year PC doldrums.
2) Micron/Crucial is about to introduce PC2100 DDR ram. Doing that will involve converting over much of their production line capacity to DDR manufacturing, which is only a little different, but it is different.
3) Crucial is pricing the fastest and best SDRAM now to clear inventories.
4) Once they've converted over to mostly, or a lot, of DDR memory manufacturing, Crucial SDRAMS at least may go back up in price, as they become more scarce.
Well, its a theory anyway.
BTW, Tom's is now agreeing with AnanadTech that DDR only increases system performance a very small amount ABOVE THE LEVEL OF KT133A boards, running fsb of 133 (or more, overclocked). (Further, there is considerable reason to think that AMD is having a hard time making the 760 DDR mobo chipset work well and stable. It was initially supposed to come out around Xmas.)