Keg Connection has a stellar keg sale going on right now. Prices start at just $34.95 (reconditioned Pin Locks). No discount code is needed. Each product page should reflect sale prices if this is still going on. Pin Lock, Ball Lock and Commercial Sanke Kegs are all available.
One thing you should consider is that these bundles with Keg Connections $7.95 Flat Rate Shipping. This is a great deal!