I bought a bunch of lasers from a china seller for cheap, eight dollars each which included shipping. I tested over 50 of them and their outputs averaged close to 60 mw, some as low as 35mw, some as high as 120mw... the higher power ones the rare exception. They are cheap enough to buy three of them for that money and hope you get a higher than normal output one. Only thing is, they don't use extremely common batteries, they use the CR123 lithium which is a camera battery. You can find those on ebay too, for a dollar each but at stores, 3 to 8 dollars each and this laser takes two of them. Some sellers are illegally shipping these batteries through the US mail via air, but they are not supposed to do that making them harder to find now, here's a link to the laser, it doesn't come with batteries:
5MILES 532nm Green Laser Pointerstrong Pen High Power Powerful 8000M Pointer DX | eBay
These have a nice host, but the laser inside is rather cheap and some of them not completely stable, some get brighter as you continue to use them, others get dimmer the longer you use them...(per session, let them cool down and they are back to the start again) some stay the same output with continued use. Luck of the draw for what you get. I've run them for up to 10 minutes, the longest test I did, and they didn't fry, hard to damage them.
Shop around, this isn't the only seller for this model. I'd otherwise recommend a higher quality one, but if your budget doesn't allow it, these aren't so bad.
Note: They do not have IR filtering, I don't know the ratio of IR to 532nm light, so take away some power due to that.