Hi Annie33.
Like the others I would encourage you to keep the scope, its a good hobby and you sound like your in a good location to use it.
As to what you can expect for it, I would use the following as a guide only.
You can take a look at the following adds on Astromart for Used Nextstar 8 GPS and NonGPS scopes like yours. The price ranges from US $750 to US $1200.
http://www.astromart.com/classifieds...fied_id=384593
http://www.astromart.com/classifieds...fied_id=376314
http://www.astromart.com/classifieds...fied_id=271888
http://www.astromart.com/classifieds...fied_id=215098
Hope it helps, and pray you get some much needed rain.
If your in a really good dark location, maybe you can hold a Star Party events wiht a small entry fee.
Regards
Netwolf