I just bought 10 of them off of Midway, the same ones you need. I can't or won't call them for replacements because they won't let me pay for them.
You have to do what your conscience permits. If you call them they will send them to your for free.
There was a time when I was really poor and they kept me supplied with them, I'm not poor anymore so I buy them from someone else so they don't have to keep giving them away to me anymore.
They took care of me when I needed it and now I buy from them through retail, to repay the favor.