I buy from Jean's store myself, as well as make a few things of my own. My girls LOVE the Pine and Pumice chews from jean's store. they take them apart immediately, but the pieces usually last a week or more. I also have a couple of hanging toys from her store as well as vine balls and wreaths. I get apple wood branches from our local orchard and dry them myself, and they tend to strop the bark off them over night, and chew them over several days. We have a willow out back, and i'm going to try drying some of those branches this summer as well.
Also, we are soda drinkers here, and we let them have the pop boxes. Lily sleeps in them, and Dharma like to play peek-a-boo out of the holes. However, if your chin likes to eat cardboard you might want to consider giving them something that doesn't have a ton of dye on the outside. My girls just shred up the pop boxes, but they don't eat them. We will also occasionally take a TP tube and stick their favorite treat in it, and tuck the ends in so that they have to chew it open to get the treat. That usually keeps them busy for a while. Since our girls dont like the wheel (the breeder never had wheels for them, and they never showed any interest in either of the styles we had for them) we've had to get creative with their toys.