This deal has ended.
Today only, Dell takes $50 off Desktop PCs via code TKVGZQKZPCGFTC. This is especially useful as it combines with other offers they have. Look in particular at this Inspiron Desktop which drops from $453.99 to $349.99 to $299.99 after the code. It features 3GB of RAM along with Athlon's dual core 2.8GHz processor, so it has a lot of bang for your buck. Note that it does not come with a monitor. Shipping is free and sales tax is charged in most states.