I have a feeling (with print being dead) CQs printers/distributors keep going under, leaving them to constantly search for new ink. I know that sounds hard to believe, but go visit any street corner newsstand and I guarantee you'll be in awe. Dozens of publications have gone under in the last six months. You're either going to find old issues or not find what you're looking for at all.
The Daily Independent, a newspaper in the Eastern Sierra town of Ridgecrest, lost too many subscribers and too much money and had to sell their operations to their competitor. Only at that point did they offer digital. White River Productions, published Railfan & Railroad Magazine among other railroad magazines but went under just last month. They've always had a digital subscription option but at the same price of the print subscription - that is a BIG no-no. The Wall Street Journal is having the same problem right now. They've bundled their digital subscription with their print and it starts at $40 per month. Digital subscriptions are supposed to be simple PDF downloads and cost a fraction of print service, instead companies like CQ are contracting with companies like Zinio, requiring software to download the latest issue, you cant print or save the latest issue and it costs almost as much as the print edition.
If publishers don't get their ish together soon, the entire field will be gone within a year or two.