We have one - it's a bench type that you sit on and load (it can throw doubles). You can get some nice ones for around $130 from Cabela's. They heavier they are, the more stable they are. Look for ones that you can adjust the throwing angle.
Here is the one we have - http://www.cabelas.com/product/Shooting/Shooting-Accessories/Clay-Shooting|/pc/104792580/c/104769180/sc/104269680/Do-All-Full-Cock-Traps/706797.uts
Looks like it's a little over $214 now. Ours is about 10 years old.
[This message edited by Tred at 10:01 AM, October 10th (Thursday)]