are you just looking for one multi-vitamin(like a Centrum) or are you looking for a bunch of separate single letter (B12, C, D, Calcium) vitamins or odd supplements (glucosamine, etc.)
i get all my supplements from puritan's pride. they often have buy 2 get 3 free offers. i just got a years supply of vitamin D for about $15. and if you go through mypoints or ***************, you get points toward those rewards.