Here is an easy cheap solution for you. Just buy a nice, not very sat in, passenger seat.
The top and bottom can be interchanged with the drivers side. For the bottom seat there is a threaded clamp that the hingle bolt goes through, easily removed and can be put on the other side. The bolt holes for the mechanism on the seat bottom are already there, just need to poke through the foam to get to them.
For the seat back pry the foam away from the recline mechanism and it too can be unbolted as well as the hinge on the other side.
The worst wear on a passenger as far as foam will be the bolster on the seat bottom where people got in and out of the car. However, you will find that this really is not an issue when you use the passenger side seat bottom on the driver side because the carpeted center will actually push the bolster that was once the outer passenger seat bottom bolster back into place and hold it there, making it look perfect.
Because the inside bolsters, top and bottom, on the passenger seat were never really touched by people getting in or out in all the years it was in the car, when these bolsters become the outer bolsters of the drivers side they look as firm and perfect as they did when the car was new.
You can then do this with your drivers seat. switch it to the passenger seat and will get essentially the same result on both sides.
Hope this helps you. I have done this several times and I don't think you will be disappointed with the results.
[This message has been edited by FieroMonkey (edited 01-26-2010).]