I stumbled across this today while placing my monthly Amazon UK order.

http://www.amazon.co.uk/Underworld-T...7788021&sr=8-2

After VAT removal and shipping, it should be around $28 shipped to the US. Not a bad price on the Trilogy. I don't know about the region status on the individual releases. Once I got my hardware modded region free Oppo, I quit caring.