Here's the total pricing and summary of all the components-
Motherboard and CPU - Intel Atom BOXD945GCLF - $63
Display - Dell S1709W - $99
Hard Drive- Seagate OEM 160GB - 39$
RAM - Corsair 2GB DDR2-800 - 10$
Case and Power Supply (Generic) - $20
Keyboard and Mouse - Logitech Combo - $10
Optical Drive- Samsung SH223Q - $25
The total pricing of this rig comes to $266. You can shop for some of the components from brick and mortar stores to save on shipping costs and bring the price down.