What power are you looking for and [ftp]http://www.dealextreme.com/products.dx/category.134 [/ftp] is a good place for cheap lasers that are decently good although they might not have IR filters. Im also not sure if they are leadlights or not.
Regarding DX. They aren't leadlights, but they are not too bad. I wouldn't buy one to mod, and they can have lots of IR. If you know that going into the deal and know how to handle a laser safely, the IR shouldn't be a deal killer.
I have a DX 200 which is about 50% IR and averages about 150mW. For the money it is a great deal. (I sort of like the IR)