If your looking for used, keep your eyes on the types of tt your interested in (many different options). The wider range your willing to accept the better chances of finding one. Then there is price range. Again know what your looking for and what you feel comfortable tackling. For me I was looking for a project, some are looking for just cosmetic fixes. Either way, if you see something you like, as other have mentioned, you have to be able to act quickly and be willing to travel. I found the one I was interested in called the seller and was on the road for 34 hr road trip within a couple of days. All part of a great experience. Got lucky to meet a quality owner that was very honest. First experience did not go as well. Drove 6 hrs to Toledo to look at an old boler
that needed much work. Owner did not tell me it was completely abused by mice. Not easy to turn around and drive away but fortunately, the bad vibe I got from the owner (knew he picked it up out of a field for a few hundred and wanted to make a healthy profit) made it easy to walk away. Again, do your research, when you find what you want, get in contact with the owner, ask as many questions as you can, then trust your gut. Good luck and remember this is all part of the journey.
Best of luck with your journey.