Guiding Scope

Hello
I own a LX200 8", and want to build a guiding system using a webcam and a guiding scope.
I'm kind of new in this hobby, so I need some advice about a good choice for a guiding scope.
Price is an issue, I don't want to spend too much money on it (no more than $150).
For example, I think that one of the ETX (ETX-70 or 90) would do a great job, but the problem is that it seems one can't buy only the scope, one have to buy also the mount, which would be a waste of money...

Any input?
Thanks,
Alex

I picked up an ETX 70 OTA from Russell Optics. They're listed on the home page here. It came with a crosshair eyepiece, dust caps and a set of rings but no dovetail. It also fits your budget. Check with them to see if they have any more.

You would probably be better off using an off-axis guider with an LX200 or any other SCT. THe problem is the mirror shift--as you move the scope, the mirror moves ever so slightly. In the course of a long exposure, the mirror will move ever so slightly, ruining your exposure. (Not everytime, but often enough that you should avoid the separate-guidescope with an SCT.) THis problem is inherent with the most commonly used focuser system. If you have a mirror lock you can avoid this problem (newer LX200's do, I understand.)

Other than that, and decent refractor will do for a guidescope. You can pick up such just by putting a want-ad on Astromart.

Be sure to get a good set of rings that allow you to aim the guidescope somewhere wlse besides where the main scope is pointing, and then fasten down tight, so the tube cannot flex.

Alex