There are only a few toys that have lasting power at my house:
1. Kong. The big one.
2. Nylabone. I think it's called the Wolf size. It's pretty dern big. They do eat it eventually but it takes a few months. There's also one that is shaped like a rawhide bone, and that one is very much still intact after a year! I got it at Target.
3. These really cheap fire-hydrant-shaped toys from Walmart. I don't know who makes these things but the dogs love them, and they are hollow so you can put peanut butter in them.
They come in blue, green, and red I think.
4. The rubber tire-on-a-rope that also comes from Walmart. They tear the rope off the first night but then the tire lasts forever.
Good luck!!!