RedSail has seemed to be the best low cost lasers found by zone members thus far. Possibly the RedSail 3040A or other model.
More info please?
Im assuming depron is that foam stuff for building model aircraft?
What cutting area do you think you will need?
Here are two links.
http://www.cnczone.com/forums/showthread.php?t=14100
http://www.hflaser.com/
Send a Private message or e-mail to zone member 'Leo Redsail' and Im sure he will give you some advice. You will find him on page '25' of the first link above.