Best prices on Client operatingsystem in Operating Systems. Check out BizRate for great deals on Operating Systems from Microsoft, Apple and 3Com. Use BizRate's latest online shopping features to compare prices for Client operatingsystem. Read product specifications, calculate tax and shipping charges, sort your results, and buy Computers & Software with confidence. Easily narrow your search and find the product that's perfect for you: Mac OS X v10.5 Leopard - 10-Client License - Apple Mac OS X 10.6 Snow Leopard Server Unlimited Client - NEW Full Retail Box.