Huh? Tiemco, Daiichi, Gamakatsu, Eagle Claw, and even Mustad (granted not all styles) all still sell boxes of 100. Dai-Riki is the only mainstream and common in US company I can think of that only sells hooks in a single quantity retail (boxes of 50).
If the OP is worried about paying shipping, what he/she really needs to do is to shop around a bit for a vendor that offer free shipping on a minimum order.