So I'm in San Francisco right now and need to get a microSIM for my iPad. I have done a search and apparently one can walk into an AT&T store and purchase one for $16, but I went into an AT&T store yesterday and they told me I have to order one online (?). Anyone know if they've changed their policies or something so that you can't buy one in a store, or if that store was wrong? I do have a US credit card so activating it won't be an issue, just need to get the SIM. Thanks!