The absolute cheapest build for BF2

[Mr. Switch]

MSI K8T Neo-V S754 VIA K8T800 ATX Mobo $49.00
http://www.newegg.com/Product/Product.asp?Item=N82E16813130498

eVGA Geforce 6800GS 256MB AGP 4X/8X $209.00
http://www.newegg.com/Product/Product.asp?Item=N82E16814130002

A-DATA Vitesta 2GB (2 x 1GB) DDR SDRAM (PC 3200) $155.99
http://www.newegg.com/Product/Product.asp?Item=N82E16820211014

AMD Athlon 64 2800+ ClawHammer 800MHz FSB 512KB L2 Cache S754 CPU $113.00
http://www.newegg.com/Product/Product.asp?Item=N82E16819103485

Athenatech Black/Gray Steel ATX Mid Tower Computer Case 350W Power Supply $26.99
http://www.newegg.com/Product/Product.asp?Item=N82E16811190050

SONY Black 16X DVD-ROM $20.99
http://www.newegg.com/Product/Product.asp?Item=N82E16827101131

Western Digital 40GB 7200 RPM IDE UltraATA100 Hard Drive $42.00
http://www.newegg.com/Product/Product.asp?Item=N82E16822140118

Microsoft Optical Wheel Mouse USB + PS/2 $14.99
http://www.newegg.com/Product/Product.asp?Item=N82E16826105123

Scythe Black PS/2 Wired Standard Keyboard $5.99
http://www.newegg.com/Product/Product.asp?Item=N82E16823105204

SONY Beige 17" CRT Monitor $120.99
http://www.newegg.com/Product/Product.asp?Item=N82E16824006005

Thermaltake TR2 430W Power Supply - $39.99
http://www.newegg.com/Product/Product.asp?Item=N82E16817153023

TOTAL $818.93

Thats top-to-bottom, everything one needs to build a complete PC.