There's not much difference in the cost price vs RRP for the Italian 9L kegs. If you can get a measly 10% discount off the RRP of $140-145 from your local brew shop, you'll be at pretty much the same price as what you'd get for a bulk buy for a LOT less hassle.
I've bought 2.5 & 3 gallon kegs from Chi Company too, & this works out at over $130 each with shipping, but I have to say I love the extra capacity of the 3g (12L) kegs, but hated having to deal with the uselessness that is Chi's customer service & long shipping times...