There are two level of automatic dishes. Carryouts - which are small bubble looking dishes you would take outside when you stop and it would find the signal. Generally inside is quite a small dish, so they work in more limited areas, and are limited to Bell and Telus for now. These generally are betwen 850-1000. The King Quest is the most popular, but there is also the Winegard G2+
There are also roof mounted auto pointed dishes. These are a full dish mounted on a folding motor - the full dish allows you to receive the best signal possible without leaving your RV. Simply press a button and the dish will lock on itself, giving you TV within minutes. Winegard produces the Travl'r, priced around $2995, plus installation.