Looks pricey....i ordered 6 of these a while back.
http://www.ebay.com/itm/New-6-Super-...item35baace5bb
If you search around you can find them for 2.99ea w/free shipping. It took a while to get them but they are the same as the entergizer version sold in the major reatailers for $15-20. I like them cause the push button on/off is tough to acidentally hit while you have it in you drybag or whatever....I've only broke on so far only because it got dunked.
Since everything on my yak is destine for Davies locker anyway, i have a hard time spending alot of $$ on such a simple piece of equipment.