Aldi's has a laminator occasionally. It cost $20 and is a really nice one. I don't know if you can get one now or not. I know that they carried them just recently. It's worth the wait.
I know that WalMart carried a small laminator for about $25.00. I do not know if it is worth it or not. My eye has been on it for a few months but I still am not sure if I want it yet.LOL
I have the WalMart Scotch laminator. It paid about $30 for it and LOVE it. I haven't had a single problem with it. The refill sheets are $13.88 for a pack of 50, so that's a average of $.28 a sheet. I pay $.17 an inch to have bigger stuff laminated, so it's a pretty good deal. Check out my blog, there's some post there about it.
BTW, here it is on Amazon just to get a little more info about it: http://www.amazon.com/Scotch-TL901-Thermal-Laminator-2-Roller/dp/B0010JEJPC
Marcia, I looked at your blog & just wanted to say that I love your class room setup! I so wish I had an extra room or area to do a class room like yours.