What I'm trying to do isn't that complicated. I want to renew my Classic Trains subscription, and in the same purchase / payment, order the Classic Trains "Great Trains: Freight" upcoming special issue. Apparently there's no way to do that. I can get the special issue in my cart, but there's no way to add a subscription to the cart. I can renew my subscription, but since the special issue I want isn't one of the three advertised as add-ons, I can't add it. Seems to me it should all be part of one system, not completely separate ones??
Another oddity - it appears I can pay for something from Kalmbach using PayPal, but only if I use a credit card. I can't use PayPal credit, or money from my PayPal balance.