Yes, it was a pretty easy process, I just dropped the back off at my dealer end got it back less that 10 days after. But as drevil says I live in Denmark where P1 HQ is located. But in these days shipping all over the world with FedEx og UPS only take 2-3 days depending on you location. Of course there can be issues with customs but if you go through a dealer they can probably take care of that with no issues.no need to pm me, i haven't done the switch by myself, it was done by pemihan, he had an iq180 i wanted to buy and he still had a free swap for that. so check if the back you gonna buy still has value added warranty and if the one free swap is still available.
he sent it in to phase, luckily for him he doesn't live to far away from the P1 HQ, so it was done quickly.
before, so has it the rumors, phase didn't actually swapped the mount of the back but gave you a new/or used back in the mount that you want. in my case it seems they actually physically switched the mount. as we know. contax mount backs are pretty rare.
if you have anymore questions, just fire away
But yes the cheapest thing would be to find an IQ180 or 280 (same sensor) with remaining value added warranty where the free mount change haven't been used.