Free Sample of Centrum Flavor Bursts This post may contain affiliate links. Please see my full disclosure policy for details. August 7, 2013 7 Aug Pin0Share0TweetGoogle+0shares Visit Walmart.com and request a free sample of Centrum Flavor Bursts. Your free sample will arrive within 4 weeks. This offer is limited to one per household. This is the vitamin I personally use, so getting a free sample of them makes me smile!!