ok, I know this post is years old, but I didn't see any anti-necro rules in the rule set and haven't witnessed any member bashing about necros (which is a good thing).
Anyway, I picked up a pair of these at my local Harbor Freight:
http://www.harborfreight.com/general-merch/lighting/pack-of-2-dynamo-led-flashlights-65207.html
With my 20% off coupon, they came out to $2 each, so I figured it'd be worth getting to at least try them out. If they were crap, I'd let my grandson have them.
I cranked one for 1 minute (2 commercials during The Big Bang Theory), turned it on, and started my timer on my phone.
After 2 hours, the lights were still on! Not as bright as they were at first, but on. A few turns of the crank (about 30 seconds) and the brightness came right back.
I'm definitely picking up more in the near future. One for each vehicle, one for each BOB and GHB, one for my work survival kit, and a few as barter fodder.
Sure there are better quality ones out there, but the $2 price point is amazing, IMHO.