How do I find the price for a extra picture card for a fine pix a 345 digital camera?

walmart.com. Try that and click on their camera catalog.

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The A-345 uses xD memory cards (Don't confuse with SD). The best bet would be to buy the SanDisk version, usually cheaper. A 512 xD card would cost you $74.99 on the SanDisk site, but you can get it cheaper on the net. With a 512 card you can store about 269 photos.