The Model Railroad Hobbyist Store is having a sale on their downloads.
With some already marked down you can save more with this sale (35.52% off).
https://store.mrhmag.com/store/c15/downloadsI figured for the price (example I saved more than I spent on my order) I could give a few a try.
Some titles
Signaling Your Layout
Airbrush like and expert
Weather Like a Pro - Freight Cars
Weather Like a Pro - Diesels.