They have great deals updated every day. Such as this one (and they have ones on laptops):
New Dimension 8400, Jun 21
Dell Small Business introduced the new Dimension 8400 desktop. Latest Intel P4 processors up to 560 (3.6Ghz), DDR2 memory, PCI Express slots, Intel 925X chipset.
Pentium 4 550 3.4Ghz/1MB Cache 512MB DDR2/400Mhz/40GB, CD/CDRW, ATI Radeon X300 SE PC Express Video card starts at $969 after rebate.