The best deals I've found are
Bully Sticks - All Natural Dog Treats - Best Bully Stick and I buy the 6" thick odor-free ones... can't smell 'em really at all (unless you put your nose up to them real close!! LOL) and they last us a long time. My 16lb'er takes about 5 days to finish one. He's not an aggressive chewer, I just leave it out for him whenever he pleases to chew on it. Bully sticks are 100% digestible and one of the only bone type treats that Jackson will eat and really love. The other ones we buy are Himalayan chews.