I don't know what part of the country you are from, but here in Colorado, tigers are pretty easy to find prowling about on rainy nights during more temperate seasons. I adopted mine after someone put him in my mailbox as a prank in August. When I went to the local pet store to purchase supplies and find out how to take care of him, they told me that they had one for sale (very cheap for such a beautiful creature!), after an employee found it behind the store.
I don't have any advice for you on how to find one during the winter, as I am sure they are all hibernating.
You also asked about habitats - the following is a photo of my set-up. I have learned on this forum that I am not completely kosher yet, but my salamander seems pretty happy so far. He's healthy, is growing, interacts well with me, and is a lot of fun to watch.
When I took the picture a little while ago, I was worried that the flash from my camera would traumatize him, but he can be seen peering out from his coconut hut in the shot. It seemed to energize him, rather than frighten him.
