TigerDirect.com offers the ECS K8M800-M2 Socket 754 Barebones Kit
for $99.99. This $10 mail-in rebate
drops it to $89.99
. With about $17 for shipping, it's among the cheapest such kits available.
It includes the Diablo CAS101-SK Mid-Tower ATX Case, ECS K8M800-M2 Via Socket 754 MicroATX motherboard, AMD Sempron 3400+ 2GHz processor, and 400-watt Power supply.
Rebate expires July 31.