That is probably going to be hard unless you can find one inthe for sale section. Maybe try all of your local junk yards in town, unfortunately there werent a whole lot of Gen2 Wagons on the road in the first place though.
I know some of the junk yards are set up up on a nationwide system where they can check inventory at different ones that they are associated with maybe that would be helpful.
You could maybe try
www.taprecycling.com they do almost all Toyota vehicles and are located in Ca. I was jsut on their site and it looks like they actually have quite a few Gen2 Camry wagons in several different colors. WHo knows maybe you will get lucky.