Good CHEAP batteries for the prevail?

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http://androidforums.com – Hey guys and gals. So I retired my prevail a little while back, and it kind of had a rough life toward the end and since. I recently started making apps and stuff, so I want to break it back out for testing on samsungs. Im trying to charge it up, it will show the battery charging green bar thing, do that a couple times, then flash an empty battery with a yellow warning triangle on it, then go back to green, then vibrate like crazy. Pretty sure its just a battery thing, or at least its worth a shot getting a new one. Any preferred spots? Besides ebay. I dont use it. any one have a re (General)