Dell Optiplex GX 280's - Brooklyn - sdram

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.