How much do you want to spend and how often will you be using it?
For relatively little money you can get by with a foot pedal type where you stomp on the release bar. I bet if you put up a WTB ad, someone here has one they'd love to get rid of. A manual trap will be easy to transport, there is no battery to lug around and they are substantially less expensive than an electric trap.
However, once set up, it is much MUCH easier to shoot by one's self with an electric trap, unfortunately the ease comes at a stiff price.
Champion and Do-All both make great machines in the $250 to $400 price range. Champion's WheelyBird is popular because it comes with wheels, and can be upgraded with a wobbler when you are ready to up your game. They all come with a foot activated switch, but some (like my Do-All) came with both foot switch and a wireless remote. I like the wireless because there is no cord to trip over, but the remote is tiny and can be easily lost.
If you add up the cost of a thrower, wobbler, battery and accessories, you could easily end up spending over $750. You might be better off shooting at trap range if you are only going to shoot a few times a year.