Amazon UK has The Pacific: Complete Series Tin Box Edition on Blu-ray for $25.09 (£15.97). At checkout, it falls to $20.91 (£13.31). Add $4.84 (£3.08) for shipping for a total of $26.66
Features all 10 episodes on six discs. This set is Region Free and should have no problems working in the U.S. I have bought Band of Brothers, also Region Free from Amazon UK and they work just fine, including all special features/extras.