Pistolera

I'm scheduled for my VSG in Tijuana on 5/22 and am trying to compile some necessary items to take with me in my hospital bag, and one of the things I'm having a hard time finding is the Gas X strips. It seems like many places are out of stock. I wonder if these are being discontinued? (I've heard varying reports on whether or not these work, so maybe that's why?) I'd rather have them than not have them though, so if anyone has any extras that they would be willing to sell me, let me know!