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$30/piece for batteries is a really good price, but if you don't mind a little extra work, you can call all the places you have in the area that sell batteries and ask if they will sell you battery cores. Not very many places are willing to do it, so you have to make a lot of calls- or even better go in and talk to the manager and explain your project. Most of the batteries you get will be good and just need a charge. You can exchange bad cores for good ones elsewhere, and eventually you will end up with a good solid set to work with. I used to pay $7/each for battery cores, and now I found a place that sells them to me for $2. A word of advice though: don't leave your batteries outside. I got a whole bunch stolen that way.....
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