I didn't buy mine all at once, but my LHBS sells a kits. This one is $227 USD.
# Dual Guage Regulator
# New 5# CO2 bottle (empty)
# Two Used 5 gallon Corny kegs (may have labels)
# 15 feet of Thick Wall Gas Line
# Two Picnic Taps and Dispensing Hoses with regular barbed beer disconnects
# Gas disconnects with MFL threaded barbs
Keep in mind, the kegs in this kit are used soda kegs, so not new. My LHBS has a lot of kegging supplies. Check out this link to see their kits.
Their prices seem pretty fair, but I haven't really shopped. Since they're local, there's no shipping for me when buying from them.