ryan …
for a cheap made in china (they all are) power supply … you can even get solar ones that you can strap to the back of yr pack in the day, not that i know how effective those are
try here …
and here …
make sure to read the comment in the reviews and forum posts at the bottom to watch for any compatibility issues … on the other hand they are cheap as hell … also note that deal xtreme takes a while to ship generally
but sure beats spending $$$$ on a brunton sustain that has a few poor reviews on REI and amazon anyways

