Cosmo and Cori go through bully sticks like it's their job.
Cosmo can tear through a 12" bully stick in about an hour. He is a heavy chewer, but luckily doesn't chew on anything of ours.
We usually go through www.bestbullysticks.com
and are pretty happy most of the time. We did get a bad batch that smelled pretty bad, but overall they are good with customer service. They are around the cheapest on the net too.
Do not buy anything that says their are smoked or flavored, those will stink the worst. Look for free range or anything that indicates they are hung dry.
Perhaps we can put together some kind of group buy at one of the Internet merchants, I spend about $50 bucks on bully sticks between my two dogs every couple of weeks and it's startin to hurrrrrrt!