Thinking about building a Maine Two-Footer model railroad in HOn30? Well, let me give you some valuable insight!
First thing you need to know, ALMOST nothing is "ready to run". The photo to the right is typical of almost every piece of rolling stock you're going to have. This is a vintage wood kit. The new stuff looks the same, but the major parts are cast in resin instead of being made of wood. 3-D printing is starting to make a small impact, but that's mainly if you own a 3-D printer and have the skills, or know someone who does.
There are some suppliers who currently offer some kits, such as Mount Blue Models and Funaro & Camerlengo, but otherwise most of your rolling stock will be ebay finds.