You've got a couple options. Menards sells an inexpensive version - I think it's a couple hundred bucks. Another route (which I took) was to have the commercial version installed. It's called a "jackshaft" opener. Not cheap, but they've been on the market for a long time, and any good garage door company should be able to do the install for you.
Be aware that commercial jackshaft openers don't have any provisions for light, so you'll have to come up with a way to turn on a light when your garage door is opened.
Here's a couple pics from my install: