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They're not that perishable; we're not talking about vine ripened tomatoes or papaya. You can't keep them, with minimal environmental control, for months and months the way you can yellow/Spanish onions, but you can certainly take them across country in fine shape. And if you wrap them very tightly and refrigerate, they actually hold up pretty well for a while at home, too.
Finding Walla Wallas per se may be somewhat random - the places I shop never have more than one variety at a time, and seems to be whatever they can get or whatever's cheapest at the moment. But sweet onions in general are commonplace these days, if they don't have to be specifically WWs.
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