What kind of motherboard does your case support? I'm guessing an ATX... Here's what I found that is an ATX motherboard:
Motherboard (ASUS "A7V8X-X" KT400 Chipset Motherboard for AMD Socket A CPU) ($52): http://www.newegg.com/app/viewproduc...131-451&DEPA=1
CPU (AMD Sempron 2400+ 1.667GHz, Socket A Processor) ($67):
Memory (Kingston 184 Pin 512MB DDR PC-2700) ($63):
Video Card (eVGA nVIDIA GeForce FX5200 Video Card, 128MB DDR, 64-bit, DVI/TV-Out, 8X AGP, Model "e-GeForce FX5200(128-A8-N304-LX)) ($54):
Hard Drive (Maxtor 40GB 7200RPM IDE Hard Drive, Model 6E040L0) ($47):
Whew... I know it is more than you said, but this isn't the worst stuff out there either. I'm new to this stuff, so get someone else to make sure all of this is going to work together. I'm pretty sure it will, but make sure someone else checks it if you decide to go with this.
I did the best I could... Hope it helps!