It all depends on the fetures you want on your board.
Like said, there are $50 boards out there, but they are going to be the least on features.
But if you want a full blown board, you can go with the Soyo Dragon Plus (Fully packed board).
Then there is the Asus A7V266-E. Again, fully packed, not as many features as the Soyo, but personally I love Asus.
Abit's has the KR7A-RAID, again, another fully loaded board.
All of those support PC2100 Ram. And if you have to go order some PC2100 ram, goto
[L]http://forums.anandtech.com/messageview.cfm?catid=27&threadid=657990[/L]
and order some Crucial for cheap.