You have to decide if you want bullseye type "target" practice, or something a little more expansive (and fun).
As smince mentioned, a decent airsoft gun will work with your "real" holsters, and will allow you to practice things that you normally cant or wouldnt. The guns do work very much like the "real" thing, and while you dont get true recoil, its enough that with the slide operating, you need to track the sights just like a real gun.
Only downside here is, you probably wont come in at or under your $75 limit.
The "plastic pellet" guns are not inaccurate either. They may not be target grade like some of the others, but they will often surprise you. I have an electric MP5 with an old red dot on it that will put 5-6 out of 10 into the 1" holes on my burn barrel 35 yards off my porch on a clam day, and the misses are usually not by much either. I can easily hit people sized trees and targets at 50 yards with it. The pistols are pretty darn accurate shooting "target" style too.