I'm offering a mint condition, Orion Ultraguider OAG (Orion part # 05139). This item originally sold for $129.95 but seems to no longer be carried by Orion. Here's a description from the Orion web site:
"Allows Helical Focusing of the Guiding Eyepiece
The Orion UltraGuider has all the features advanced astrophotographers want:
Wide-range lateral prism adjustment lets you choose from more guide stars than most guiders allow. The eyepiece holder can be rotated for a more convenient angle.
Precision 1.25" helical focuser instead of the crude slide-the-eyepiece focusing of standard guiders.
Adjustable camera focal plane position allows easy adjustment of camera orientation separate from the guiding eyepiece. Add to these features the sensible price, and you'll know why so many deep-sky shutterbugs choose UltraGuider!"
I'll let this one go for $75.00 + shipping CONUS (+ insurance if desired). I prefer Paypal but will also accept USPS money order or a cashier's check.
Thanks for looking.