How old/large of a plant do you want? You can probably buy good size taxodiums from nurseries in your area, seeing that they're hardy in the landscape there. If not, you can buy them from Forest Farm, Evergreen Garden Works, Glasshouse Works, Meehan's Miniatures, Brussel's Bonsai, and a host of other sources.

Al

I was looking at one from bonsai boy of New York 10 years old is this a good place to buy from