Together these make a complete autoguiding solution that works well. The DSI can also be used for imaging.
Meade one shot colour DSI with original box and accessories: 1.25" nosepiece, cables, parfocal eyepiece ring, Autostar Suite CD.
http://www.meade.com/dsi/overview.html
$200 postage included.
Shoestring astronomy GPUSB guide port interface - sends guiding corrections to the guide port of your mount.
http://www.store.shoestringastronomy.com/gpusb.htm
$80 postage included.
I'd prefer to sell the two as a package but will consider selling them separately if there are no takers for both within a few days.