After years of swearing I would NEVER drive a minivan, I bought an 2006 Sienna LE. I think I got the last one in the US, on the last day of 0% financing

. While I'm happy with it, I
really wish it had 2 power sliding doors. Has anyone had any experience with making a non-power door powered? I know it will probably be $$$, but I'm prepared for that. I've talked to one aftermarket shop who hadn't ever done it, and talked to only 1 (so far) dealer parts dept. who claims there are no parts available to do it. I have a hard time believing this. I'd be grateful for any help.