Why Others Don't Carry It?

Sometimes I feel so tired going to the transplant center every other week for a lab work to check my blood count level and then comes back for an Epogen shot. This thing is taking so much of our time. Thank goodness we haven't move yet or we are stuck there for hours until the result of the lab work is back. Anyway, lately, I have been talking to the nurse, Cindy that we would go back after a couple of hours so we can make use of that time running errands and do things that need to be done. And she was fine with that. She would just call us and we would go back if I needed a shot. Today, we went to Walgreens to get myself a bottle of Magnesium Oxide for my bones. I looked at the vitamins section of the store where they normally put it but I didn't find it, so hubby asked the person in the counter the to see if they have this kind of supplement, but they don't...bummer! How come they don't carry it while other Walgreens do? I don't understand! I guessed, we need to go to Costco again tomorrow just to get myself magnesium supplements.