In my opinion, they are worth buying online and paying the shipping.
I buy several pounds at a time and divvy them up into small vacuumed bags.
Beans and corn bread or rice is a complete meal that has all of the essential amino acids.
Toss in a hog hock/shank, or some sow belly, and you have a tasty meal indeed. Especially if you have some Okra, rolled in corn meal and fried, to go with it.
Very cheap and very good for you.