A postscript to that story is that when that store was useless, I went to a different store listed on the Free Comic Day website and although they also didn't have the free comic I wanted, I ended up spending fifty dollars there - I think that is doing free comic day wrong, but I was glad I found it. I've also gone back to buy another couple of things. They have lots of webcomics books and a big selection of translated Japanese stuff which my local shop doesn't have any of - they are mostly superheroes etc with just a tiny section of graphic novels and indie comics. Whereas when I walked into this other store I immediately found on the first shelf I looked at a half dozen things I already owned, which is a good sign.
I buy most of my books online and I buy nearly all of them as ebooks now, except for comics, which are not fun to read as ebooks. Even the Amazon samples often aren't really useful, so it's good to have a place to look at them physically.