I know that not ALL arts and crafts stores sell pods, but which ones do? I know that there's two Michael's places around here, but I've never gone in, no reason.
Sometimes at craft stores they can be treated to keep them from going bad. Some might put a thin varnish on them. If it's possible for you to mail order, that might be a better way to go. I think it's a lot less suspicious that way too....but I always think people know what I'm up to by looking at me.