I love firstly Frog and Toad and (close) secondly Craftland for all my RI-themed artwork needs. My partner and I have gone (admittedly) a bit overboard with our PVD artwork and have had to make a concerted effort to mix it up lol.

I also especially really like The Strange Worlds of When Providence Series, which I believe Craftland (and also maybe Frog and Toad?) also sell.