You can sometimes find a Skill Worm Drive on sale for around 79 bucks.Honestly, look at pawn shops. They are great places to buy tools.
I am a framer, and I've used just about every brand. I'm not impressed with bosch, but Milwaukee and the Older Skill or the new worm drives are great. Not a big fan of the cheap Skill that is black, they just feel cheap.
If you aren't going to use it day in and day out, you will be fine with a ryobi or black and decker, but if you want longevity and day in and day out use, stay away from the cheaper brands. And don't buy from sears.