I like to make treats. It's a lot cheaper, and most of the time much healthier. For training treats, they will do ANYTHINGGG for baked chicken hearts/lungs/gizzards. They aren't as gross as they sound, I swear!

For biscuits, I always get Old Mother Hubbard. They don't use any really bad ingredients, or dyes, and such... but a huge bag is really cheap and my boys love the peanut butter cookies. I occasionally buy the soft liver or peanut butter treats by Bil Jac. They also like dried chicken treats, but they're too hard to break in to pieces, so I rarely buy them.