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Any SD card will work in this camera. This includes SD, SDHC and SDXC cards up to and including 128GB.
You can purchase these online or at any Target, Walmart, Walgreens, CVS, Best Buy etc. for a few dollars. I would suggest a 4GB or 8GB card which will hold thousands of photos and shouldn't be more than $10-$12 for the 8GB.
Please let me know if I can help you further.Steve