I mostly shoot Kodak Gold 200 and my local film studio sells them in very reasonably priced 3 packs at 27 euro. That is the cheapest colour film I am regularly buying.
Also interested, stopped buying portra, ektar and slide and just go for the cheapest multi packs I can find via Google. Often tends to be Kodak Pro image 100, which is ok but quite noticeable grain for 100 speed.
Where is everybody buying film from anywhere with competitive prices?