I've got the imprezaRS.com one as well, though i didn't like the bearings myself. I just coudn't get them to stop rattling at ~4k rpm, no matter how much grease and adjusting i tried! A few minutes pressing them out, a few more minutes with a coke can and some snippers, and i had the stock bushings in the short shifter. I lost a bit of crispness, but the throw is short and smooth, and it's quiet again. =]
I'm guessing that $240 one you saw was the complete lever/lower bushing/control arm setup. The $100 ones are just a lever and bushings, but they accomplish the same thing. In fact, mine feels waaay better than the STi unit to me.