So you need a Mobo CPU and Memory all for $150 ?
If so then i suggest you get on ebay, as for new parts that wont cut it, not with alot of change anyway but lets see...
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138293
http://www.newegg.com/Product/Product.aspx?Item=N82E16820134786
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103903
BIOSTAR N68S3+ AM3 NVIDIA MCP68S Micro ATX AMD Motherboard
Item #: N82E16813138293
Return Policy: Standard Return Policy
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-$15.00 Instant
$54.99
$39.99
Kingston 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1066 (PC3 8500) Dual Channel Kit Desktop Memory Model KVR1066D3K2/4GR
Item #: N82E16820134786
Return Policy: Memory Standard Return Policy
$26.99
AMD Athlon II X2 250 Regor 3.0GHz Socket AM3 65W Dual-Core Desktop Processor ADX250OCGMBOX
Item #: N82E16819103903
Return Policy: CPU Replacement Only Return Policy
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$59.99
Subtotal: $126.97