Semi rare digital camera batteries in BsAs

Hi all!Does anyone know a place or places I could try to look for digital camera batteries. Not really going to Carrefour, Jumbo or the other big electronic stores where they sell digital cameras - for I see they don´t carry the one I need the battery for, nevermind the battery itself. I´m thinking, hoping for a store that sells cellphone batteries, camera batteries and stuff like that, more specialized. It's your typical one-two year old Sony pocket digital camera. But maybe too new for BsAs ;) and thus I haven´t seen it around. Thank you for your help.
There is a battery store on Tucuman & Suipacha.
You can just stop at any place that sells something remotely similar and show them your battery. If they don't have it, they will tell you where to find it.