As I wrote last year, you can get a nice amount of credits (if you’ve researched most nations, or even better if you are a Senior Technical Engineer) by buying and selling discounted tanks you don’t need. A wise reminder by QuickyBaby, you can keep some of these for the upcoming wheeled vehicles or unresearched tech trees. Last year TAP reader Quaksen, posted this list which gives us some idea about the possible profits.