The idea was to make a system out of a NES for less than $400
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Nintendo Entertainment System
   $9.00 (ebay.com)

Mini-itx VIA EPIA 800 All In One Motherboard
   $120.00 (mini-itx.com)

round ribbon cable
   $7.00 (mini-itx.com)

dc2dc Value package 1 
 - DC-DC power converter (60W) 
 - AC adapter(60W) with AC power cord 
 - ATX 20-pin connector (210mm) 
 - DC power jack & cable
   $60.00 (dc2dc.com)

Maxtor 40GB IDE Hard Disk Drive
   $25.00 (ebay.com)

4 port mini USB hub
   $5.00 (ebay.com)

Dell DVD/floppy combo drive 
   $40.00 (ebay.com)

Slim ATAPI to Standard ATAPI Adapter
  - for using a laptop CDROM/DVD/CDRW in a standard drive bay
    $10.00 (junkmachine.com)

Ultra Low Profile Memory  PC2100 / DDR266 256 MB 
    $75.00 (logicsupply.com)
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 Total : $ 351.00