Try visiting a pharmacy near you. I have often seen them hanging from shelves. Both local pharmacies and big name ones like Duane Reade, CVS, Rite Aid will carry them. If you wish to wait or for a cheaper price, you can order online from places like Amazon. com or ebay. com
Drug stores, pharmacies, and larger retail stores, both local and online, that sell pill boxes and organizers usually sell pill splitters. If the pill is scored, you should be able to split it with your fingernail or a knife.