I think you might have looked at the bulk rate for 100 sticks. They are usually only a few dollars a piece.
I personally like the Merck flossies - I believe one is about $3. Also, the Hide-A-Squirrel is $14 online, I just bought one myself.
Did you pup lick the bully stick at all, or did she display no interest whatsoever? I bought Thor a whole bunch of bones, which he would lick for a bit, but he only tried chewing once.
Recently I started soaking the flossies in water to make them softer and he ADORES them now. They are probably not as good for his teeth, but he still gets all the chewing enjoyment out of them.
You sound a bit discouraged with your pup. Is there a yorkie / small breed club in your area where you could meet other yorkie owners? Try googling your city and "yorkie meets". Maybe you can find someone to do toy exchanges with.