I have just seen a bit of info where you use a 16 GB SD card (the fast ones Extreme III @ 30 mbs) insert them into a Kensington (Expresscard 7-in-1) adapter and hey presto you have a KxS for a fraction of the price.
One of the drawbacks is that the card sticks out from the little window slot which may or may not allow it to still fit in a housing or effect operation. But even for surface stuff if you are filming for long periods and do not have a laptop close by it could prove a little more cost effective.
Without using SxS you will not get all the error correction and other features but it could be the start of getting affordable solid state cards.
I have been trying this with mine for the last month or so - using a transcend card and a reader, it works but i really dont trust it. But it is nice and cheap!
I believe it is dependant on firmware 1.11 which you can find out if you have it by pressing 3 buttons on the back of the cam, cant remember which ones off the top of my head. Or do like Dean and go bug the Sony Rep.
I'm not sure that I would risk any income producing time on what is at best a makeshift work around.
For sure I would not be prepared to take a chance with a clients money (or even mine ) given the cost of a few cards is a relatively minor part of the overall budget.
Not shooting the messenger here as it certainly would be good to have this option as a plan C although I would be inclined to invest the money is an small SxS card.
Totally agree regarding a paying job, at the end of the day you would package in the cost of SxS for the job and pass that on...
But for someone who is going away on holiday and can't be bothered to take a laptop and doesn't want to spend heaps on SxS then it could be an option.