In the U.S. Kodak ships Portra 160 and 400, Ektar 100 and Ektachrome 100 in 5x7 through group orders via Keith Canham. In my experience he has been easy to reach on the phone if you would like more info.
https://www.canhamcameras.com/kodakfilm.html
https://www.facebook.com/K-B-Canham-...1324393576850/
I have a bunch of 5x7 color film in the fridge and freezer right now. I'm also a predominantly color shooter and migrated to 5x7 after my 8x10 kit had become too ponderous for field use. A group order usually occurs once each year per emulsion (Ektar less frequently, I'm not sure how popular the new Ektachrome has been). Managing film stock like this is a bit of a hassle, but it is very do-able. My back thanks me when I am out in the field.
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