I have a 10mW unit and after one second it switches to low-power mode, 5mW or less, and even then it's plenty bright enough. You might like to consider AOE instead of buying off ebay. They've got 5mW units listed on their specials page for $75.
http://www.aoe.com.au/on_sale_now.html
and you also get AOE's great after sales service, just in case you need it.
(btw. I'm not affiliated with AOE - just a happy customer.)