Anyone Know about burning lasers?

[pinkpanda3310]

I stumbled across this and thought it was cool but pricey
http://www.wickedlasers.com/

Then I found you can make or modify your own
http://www.youtube.com/results?searc...rch_type=&aq=f

I ponder on this a little further and found I can get a cnc laser a little cheaper
http://cgi.ebay.com.au/High-Power-La...item2a03745603

I'm inclined to go with the later cause it's a little cheaper and will be more reliable than anything I make and it includes a laser driver but can I use this with batteries as a stand alone unit? Any help or advice is appreciated.