We normally place track on traincity ebay auctions. There is a link in the left column of choochoo's home page. I don't think we have much track right now, but yes we do get bunches of it!
Walter, according to the site search there has been 200 pieces of Fastrak straight and 50 pieces of 036 curve sold since Dec 2, 2008. If you are wanting MTH track I don't believe there has been any since you joined.