not a problem
Drive around to CVSs (there are millions of them out there) and look for some kid behind the counter. They will just hand them to you without asking you any questions. Actually they will ask questions like after putting a couple of boxes on the counter, "Are these the right ones?". If someone won't sell you pins, tell them that you hope they get aids someday and walk out and just try again. Sometimes you get hassled, but most of the time it is EZ.