OMA's also has a frozen raw green tripe as does A Place For Paws--and their shipping isn't that bad. I get a good organ blend from them too. I have recently gotten some from another source and let me tell you, this stuff has got to be the least processed and it is the most stinkiest stuff I have ever smelled!! And I can take a lot of stink! It came in 5lb chubs and I have to thaw it to re-bag it into 1 lb flat bags that are easier to defrost. I have been very pleased with A Place For Paws, but theirs is different looking than some of the others and it doesn't stink as bad.
Still, if you can find it somewhere else, I would definitely recommend getting the frozen raw kind. I like it when it's greenish in color and totally blows your mind when you open the package!
You kinda get used to the smell, sorta.....and if you really want to go over the top with stink, you can try mixing it with fish for a lovely "fish and stink" dinner--one of Riley's favorites!