Would they be Ok with using CR123A batteries? They are like $9 a pair, but they are available for about $1 each on the internet. You might want to buy them a case if you do buy them that light. From what I've read those POLICE lights are pretty cheap quality, but I don't own one so I won't say anything more. By the way: I think you can buy those POLICE lights for a few dollars on ebay. Just type in "POLICE flashlight".
i bought that for i believe $3 from global-wholesale-direct.com. the quality matches the price pretty well but it is very bright on fresh batteries. uses a bi-pin style direct drive xenon bulb. the switch is very rudimentary, just a plastic nub on a spring behind a rubber membrane. its not a clickie but it does have the lock-out feature. if you can get it for $5 or less then go fo it but its not worth more than that. I have been reccommending the uk 4aa eled to anyone who wants a general purpose houselight. hope that helps.
If you want comparable G2 quality look for the Brinkman Maxfire or the Brinkman Legend LX. They are about 15 or 20 bucks. I have one of each and they are very good, especially the Brinkman Legend LX. It has a very nice beam.