Both Suppressed Transmission books are still around -- you can get them in print or PDF (and the PDFs are like £5) from Warehouse 23. Here's the first one and here's the second one.
Turns out Pyramid is still going; I wonder if subscribing gives you access to the old columns ...
Procopius's "Secret History" is online at the Internet Medieval Sourcebook. Or you can get it in the usual Penguin paperback if that's your thing.