best places to buy vitamins?

I am having my RNY surgery Decemeber 20th and I'm having a hard time finding some of the vitamins I need. I cannot find chewable calcium citrate in any stores. I've checked all the pharmacies like rite aid, walgreens, etc. as well as vitamin shoppe, gnc, target, and walmart.

Can anyone suggest anywhere else where I might find it? I might go ahead and order them online because I am starting to cut it close on time. Thank you.