I get tripe from Greentripe.com and in the summer from a local butcher: $5.00 for an entire tripe. I cut it up in large pieces and they have a good time with it. You'll get used to the smell.
I doubt that the canned version is as healthy since canning needs the contents to be heated.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015