We started carrying Tartar Dhield chews at work and the dogs get one of those almost every day. I was getting the extra large ones, but they're loaded with calories so I just went down to the large size. They like them, they're digestible, and they're cheap - about 50 cents each. They also get Jumbo Greenies on occasion - Petsmart has the singles for $1.06 for some reason (the next smaller size is around $2.50 o.0). They LOVE greenies.
Aside from that they also get pig ears (smoked, puffed and raw), pig and cow snouts, bully sticks, chicken quarters, chicken necks, tracheas, hooves (on occasion), sometimes rawhide if I find just the right ones, compressed porkhide "bones," etc
For chew toys they get kongs on occasion, stuffed or empty. I also have some sory of rubber Nylabone (rhino? it's rubber like a Kong but Nylabone brand and bone-shaped), a TireBiter bone, and until a few months ago I got rubber bones from JeffersPet. Logan has slacked off on his chewing a LOT in the last several months. He rarely touches that rubber stuff now.
The dogs I'm watching have some sory of nylabone that logan LOVES and doesn't destroy. My mission tomorrow is to go to a pet store and figure out what it is, and then order one online since it's probably cheaper that way lol. Logan has destroyed every other nylabone I've given him.
They also get antlers when I can find them for cheap. My trainer sells them for $5 each. But by dogs are also antler demolishers and they don't last long.