I am also interested in the Old Style Inns & Cathedrals. The new version can be had online for $15 shipped, so if anyone wants to upgrade to the new art, I am willing to pay $15 if you want to ship me your complete old version. If you no longer have the box, the rules, or the gray meeple, I am still interested in the tiles for a reasonable price. I live in Maryland.
We just acquired the base game for Xmas. Fortunately or unfortunately depending on how you look at it, we ended up with the old style artwork. My son who is 7 loves this game and we drove around to all of the local board game shops looking for the out of print expansions. We found Abbey and Mayor plus Hills and Sheep. There were no other old style expansions to be found.
cundco.de has the German version in stock still. I emailed them, and they confirmed that it's the old artwork. The shipping to the US there is pretty expensive. I think it ends up being like $40 for everything.
giochinscatola.it has the Italian version with the old artwork. I emailed them to confirm also, and the shipping ended up being only about 18EUR, so "only" $30 or so for everything in total.
I went with the latter option, but recommend you email them before ordering just to make sure. I also checked with a few amazon.co.uk and amazon.de sellers, and they all had the new artwork only.