I don't believe there is an actual store front where one can see physical samples as most everything is over the internet. I mean they have the printers that print the artwork or photographs but not sure you will be able to visit them.
If you're ever in South Carolina, I have samples of my work printed from FAA. A bit of a journey for you though, so you may just want to actually order a few prints on various formats.
Well, FAA has return policy :
If you're not happy with a purchase that you made on FineArtAmerica.com, for any reason, you can return it to us within 30 days of the order date.