As mentioned in your other thread, look for a board with the features you want.
You aren't telling us what you want (RAID? firewire? overclocking?) so it's hard to recommend anything cheaper.
A $95 Gigabyte P43 was fine for my needs, but I run at stock and don't need RAID or firewire. It's been working perfectly so far with an E8400 and ATI 4870.