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Or, if you can wait a couple of weeks, and are willing to make or adapt a 2-cell battery box for it, you can get one from Ebay.
I just bought one from them, (won the auction), for $3.95, free shipping, from China. http://www.ebay.com/itm/660nm-5mw-Focusable-Red-Laser-Line-Module-1-pcs-/261313055986?pt=LH_DefaultDomain_0&hash=item3cd778ccf2http://www.ebay.com/itm/660nm-...
Of course it's safer to get the factory part. I just got this one as a spare, along with one that projects a cross. ($5.75).