Well, depending on the specific library you end up using, you may not need SD card to run your program. Galileo has a mini Linux image installed into the SPI flash, this is what is boots if no SD card is inserted. So if you pick the one installed into the image by default, then you will only need the SD card for development (with -dev packages) and for just running it the out-of-the-box image should be fine.
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