1GB SD cards are almost impossible to find these days. Some drugstores and supermarkets may carry them, but most department, electronics, and office-supply stores don't carry them. You should be able to buy 2GB SD cards at those places. Unless you specifically need a 1GB card, a 2GB card will work just as well.
If you're willing go buy online (and pay for the shipping), you can still find some.
Here's one example.
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