John, if you post this on the exchange forum(just above the forum threads)you should get some traders. The threads are a bit old but the forum usually starts to pick up this time of year. I have a few varieties, but we are in the process of moving so everything is packed up. Here's the link also...hope you get some great ones.

Here is a link that might be useful: tomato exchange forum

You may also wish to check out the 5th Annual Pepper and Tomato Seed Exchange, in this or the Hot Pepper forum. It's my first year, but I've read great things about it. Heather says that, if you have seeds that breed true, you can send in pepper seeds and ask for tomato seeds in return.

The deadline to send your seeds in to her is approaching fast.