One A Day is a brand of multivitamins that makes different multivitamins for men, women and children at different stages of life. The price of One A Day vitamins varies by type as is usually between $10 and $20 for one bottle of 100 tablets. Prenatal One A Days are more expensive at around $30. We also provide access to a One A Day printable manufacturer coupon that gets you $1 off. Click the One A Day coupon of your choice to start saving now.