Check out Amazon or Bariatric Pal.com for vitamins, shakes, protein powders etc. I am 1 wk out from my sleeve surgery and my program said I needed the following. In either the Bariatric advantage or Celebrate brand.
I found bariatric pal.com to be cheaper due to promo codes or reoccurring ordering discounts. I also take D3 2000iu, 2xday, B12 vit orally and Biotin daily.
Good luck