I previously attempted to reply to a post by KS but my message failed to show up, for some reason or another. Anyway, as I mentioned earlier, Funeral in Berlin and Billion Dollar Brain are available here in the USA on region 1 DVD, except The Ipcress File which has been out of print for quite a some time.
Checking around the net for a new or used copy of IP can give a person sticker shock LOL! the prices are outrageous. I'll just have to be patient and wait. Perhaps they will release Ipcress File on Region 1 again in the future.