Check out the prices on Ebay and Craigslist in your area...
Maybe sneak into a shop...and take a look...
I would be prepared to offer for the lot (all of them) or just the one I really wanted...
Bid low and haggle...you can always go up but put a limit on what you would spend for one.
Remember also, if you buy from a shop then you should be able to get lessons and support and an extended warranty if you desire.
Just my two stitches!
Kirsten