ebay is where i got a stock ua-5, then modded it myself, its very very easy. then I went to wal mart and got a portable dvd player battery, the 9v version, for $50 and an adaptaplugs b & m, and the wire from radio shack (the guy at radioshack realized i was being ripped off by them and only charged me for the one adaptaplug, he rules). All told about $260 for ua-5 and battery if you go that route. Self modding is the way to go