Thank you so much for these links!

Oh my gosh, I started this thread over a year ago so I totally forgot about it, LOL. Our Wal-Mart has them again though

They started stocking them again quite a while back, but you are right, they sell out of them SO FAST!!

I usually buy several of them at a time

I don't particularly 'like' the Hartz brand either

and I actually I don't buy any of their other products EXCEPT these. My babies have always loved them and they do keep them very busy

I do supervise them constantly when they are chewing them and if I'm not right there watching them while they are chewing on them, then I simply just take them up

They have never had a problem with them though and they absolutely love the things! Silly babies!
Thanks again for these links sweetie!