If you buy any lasers on ebay, they're probably by crappy companies.
I WARN YOU NOW:
Any lasers you buy on ebay for less than $100 that are up in the 100's and 200mW's DO NOT HAVE INFRARED FILTERS!
DO NOT BUY THEM! THEY WILL RUIN YOUR VISION! INFRARED IS INVISIBLE AND AT 240mW FOCUSED, LESS THAN A SECOND IN YOUR EYE WILL BURN OUT YOUR RETINA!
These lasers start out at 808nm invisible, or near invisible light, they are sent through a Nd:YVO4 crystal which then brings the light to 1064nm (INVISIBLE) and then it's sent through a KTP crystal which doubles the 1064nm to 532nm visible green light.
I'm guessing with that 240mW you bought for $99, it's outputting less than 10mW of 532nm collimated green light.
I've been around lasers a lot, I know a lot about them and I own ones that give out true 380mW 532nm light. I also have a few more green lasers less than that power (130mW and 95mW). I am also a photographer for
http://www.lucentoptics.com that supplies high powered green lasers.
I also know that in United States, lasers above 4.99mW are illegal to be used outside of your own property, and cannot be pointed in any airspace.
If you have any questions about lasers, please feel free to contact me or ask any questions in this thread.
Here's some pictures of my lasers that were taken by me:
http://img95.imageshack.us/my.php?image=sk3sl4.jpg
http://img160.imageshack.us/my.php?image=match3ey0.jpg
http://img442.imageshack.us/img442/3425/152pu7.jpg
Also, don't buy from Wickedlasers. They're overpriced and the chanches you'll recieve a broken one is probably 1.5 in 2.