newegg sells shuttle AK32A (KT266A) motherboards for $53 + $5 shipping. plus they have an MSI board (KM2M) that is similar, KM266 chipset, but with integrated video for $59. The shuttle board allows you to choose between PC133 or DDR. I believe MSI has announced a KT333 or 400 board that will allow you to choose between SDR or DDR also (if not MSI some other one, maybe epox?)
edit: its an MSI board, still KT266A, but it support FSB333. Interesting, KT2 Combo (MS-6764). Still allows one to choose either SDR or DDR