If you don't need an output on your tuner, this one works pretty well:
http://www.zzounds.com/item--KORCA30
and you shouldn't have to pay more than $20 plus change at your
local store. I use one and have found out the hard way that they
can take a lickin' and keep on tickin'.
There's also another version that's a little less expensive made for
guitar/bass. It's silver in color, and basically the same setup.
A couple AAA batteries, and you're all set.
Good luck.
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Douglas 5 string, Nady MGT-16R Wireless, Korg Pandora PX4B, that's all it takes.
www.shackshakers.com Minnesota Bass Player Club #18