After a great deal of testing, I can say I like the tripe they sell in Kaufland. It is very well cleaned, it's refrigerated when it's fresh and it doesn't have a very strong smell.
I tried to find something similar in Carrefour, but I had hard time trying to get rid of the smell... And never get already sliced tripe, especially if you aren't really keen on the smell and the texture.
By the way, I buy tripe even when I don't plan on cooking it right away, if I happen to go to the store. I freeze it and I cook it when we want to eat tripe soup.