Arcsenciel

I had quite good results from Ivory Coat, and they have quite a few formulas now. Also, some (possibly all?) physical stores offer palatibility guarantees for Ivory Coat.

Meals for Mutts has dehydrated 100% green tripe treats, as well as a green tripe powder. I believe that Rogue Royalty also has dehydrated strips of cold-washed green tripe. Both can be bought online.