A little late to the thread, but I thought I'd chime in. I paid $800 for a year's worth of laser, starting with one every month for three months, then one every two weeks for the rest of the year. The clinic used to offer a package for five treatments, but found that it rarely removed enough hair, so now they only offer year's packages.
I've had about six sessions and about a 50% reduction in hair, and they said that's an amazing level of reduction so far. (But they also said they hadn't even gone up to maximum power for me, like they would for most people with my skin tone. But that I was still having better results than most anyone else.)
I've heard of other people paying $100-250 per session, and talking about things like getting three sessions of laser and having most of it gone. That seems both more expensive and much faster than what I'm getting, so maybe my providers just like to spread out the treatment for safety reasons or something, and use less laser each time.