Any small purchase from any of the e-store shops would do it. Some of them offer pay online with instore pick up which saves getting involved in shipping charges or meeting a minimum for free shipping.

Best Buy and Walmart are two stores that offer in store pick up.

I had to do it a couple of weeks ago on one of Mr H's non BA accounts. Going to the big W wasn't that bad, honestly. We're FT'ers. We do what we have to do for our miles!!