You can find pretty much the exact same laser on
www.lasercommunity.com in the shop section. Since these particular ones have been known for having some quality control issues, you can also try eBay, atlasnova, or other places that sell these lasers (search for "leadlight") at cheaper prices. You should be able to pick on up for <$65, and maybe as low as $30 on eBay.
Make sure you're buying a leadlight or another reputable brand though as there are a lot of crappy ones out there like NewWish and whatever those ones are that are sold by Spymode.