Head to Amazon to buy one bottle of vitamins and get the second free! This 2 for 1 vitamin deal is available for a limited time only, so be sure to check it out while you can. Amazon Prime members can enjoy free shipping, otherwise free when you spend at least $35 or more. There is all types of vitamins in this sale like melatonin, B12, multivitamins and so on. Click here to start shopping!