www.wal-mart.com - I've bought two lasers from my local store, neither one fit the guns I had at the time though, need to dig one up and see if it'll fit my Sigma though. As to lights, buy a Mag-Lite, and either one or two rail mounts, you should be good to go. (I've done it)
The standard Mag-Lite... If you have standard scope rings, you should be able to make a pretty good guess. It may take a bit of electrical tape as well.
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