Used: Optiplex GX620 Ultra Small Form Factor - 80GB HDD, 2GB Ram, DVD-Rom, 17" LCD Monitor, Windows 7 Professional - Walmart.com
Upgrading Ram in the Dell Optiplex Gx620 - YouTube
Dell OptiPlex GX620 | The Computer Exchange Shop
OFFTEK 512MB Replacement Memory RAM Upgrade for Dell OptiPlex GX620 Series (Desktop Mini-Tower and Small Form Factor) (DDR2-4200 - Non-ECC) Desktop Memory at Amazon.com