I have 3 used Dell Optiplex GX's. Two of the units are GX 280's, which I am selling for $80. These units have a Pentium 4 3.0GHz processor, 1GB DDR2 SDRAM, 40GB SATA Hard Drive, and a DVDCD ROM combo drive. The other unit is a GX 260, which I'm selling for $60. This unit has a Pentium 4 2.66GHz Processor, 1GB DDR SDRAM, 40GB IDE Hard Drive, and a DVDCD ROM combo drive. All units have Ubuntu 10.04 operating system on them.