Besides the engines Dieselman is bringing in they do come up for sale now and then in this country and Canada. However as Gary eluded to they do command a price.
Expecting one to just appear out of nowhere, be in easy driving distance and cheap is unrealistic but so is expecting to hit the lottery and some do that
1, PM or email Gary and make a commitment before they are all spoken for
2. Do a search of Ebay at least twice a week ( two been for sale in last year)
3. Same with Craig's list using a search engine like Craig's helper or zoom
4. Auction zip .com is another place to watch but searching it is a bit aggrivating to search (where I found mine)
5. Smok Stak .com web site ads (been maybe 4-5 for sale in last year there)
6. Buy one in England where they lay about like yesterday's trash and import it yourself