i found a computer for 100 dollars heres the specs Product Information
Style meets power in the Acer Aspire AS5920Ã‚Â¿6727 notebook PC equipped with an Intel Core2 Duo T5450 Mobile processor and blazing fast 3GB of memory. Maximum productivity is paired with multiple multiÃ‚Â¿media features including DolbyÃ‚Â¿certified surround sound system with two speakers + subwoofer ideal for gaming and video viewing. Staying connected is easy with the latest in wireless technology, 802.11a/b/g + draft N and with the integrated webcam and mic. All these features plus the stylish gemstone notebook design with light features and opalesque cover make the AS5920Ã‚Â¿6727 a must have.
15.4Ã‚Â¿ Widescreen Notebook PC
Windows Vista Home Premium
250GB Hard Drive
8x Super Multi DVD+/Ã‚Â¿R/RW with Double Layer Support
5Ã‚Â¿inÃ‚Â¿1 Media Card Reader
Cases and Expandability
Size (LWH): 10.6 inches, 14.3 inches, 1.7 inches
As ColGeek suggests, your best bet will likely be to check the used market. You will not be able to build a new PC for $250 that will be able to play games, especially if you don't already have an operating system (Windows). You might find an old office PC that can be upgraded with a HD6670 or HD7750 to be able to play most games.