We use a variety of the automatic clay target throwers at the club I shoot at. Several different manufactuers offer them at various prices. In general, you get what you pay for.
I would recommend you get one with the remote (batttery operated) control. That way, you can stand 100 yards away and launch the target by just pressing a button.
I don't know what they cost, but I'd guess they start around $500 for a model that will hold about 80 clay targets. Do a "Google" search for the different machines available.