filip-matijevic said:
it just isnt possible to built a custom $200 computer, i think u should buy a used one or save up some money and try this one
i personally used black friday deals and other varius deal places(ebay

) and i have almost all parts for a computer in under $200. this comp is a piece of crud, but at least it has great upgradeability.
i am using:
Proc=celeron m socket 478 1.2 ghz=$21 (ebay)
Memory=512meg stick of kingston value select=$15(soooo luckey, got with two weeks of mir together. total fluke)
Mobo=Shuttle av49pn=$34(ebay)
Heat sink=cheap no-name=$10
Case=Antec Super Lanboy=$30(black friday mir)
Power Supply=Master Power 350 watt=$5(black friday mir)
lookin for a ~$30-$40 graphics card, i have seen them
will use spare 20 gig hd untill i find a decent deal on 100 gigs plus for ~$30
Total: $175-$185
look through your sunday advertisements, they help a bundle. i love ebay also

hopefully this is close enough to what you are looking for. most (all)of these deals are not every day run of the mill, but it is possible. i am proof