Milage exchange cars turn over about every 2 weeks or so. They just finished offering the last of the lot. Perhaps they will begin offering them in a series again. I didn't realize what was happening for the first 6-8 weeks or so and missed a few. I hope the offer them again. Check on Tuesdays. The paints, wheels, etc. change weekly.
( I see I took too long typing my post and pedrocor already gave you the info)