If, like mine, your dog has diabetes you'll be pleased to know that WalMart now stocks Humulin N -U100 which can be purchased without a prescription for $24.88. This is a savings of nearly 60% compared to the prices charged by the vet.
While many places still require a prescription for syringes, Cal Vet Supply does not. For the U100 syringes the cost is around 11cents per syringe. View their page here.