Haven't had time to look around much, but am intrigued by
https://zoloworld.com/ and the Bongo US postal address thing if I can't find similar in the UK. Might be useful for more than this. I'm guessing the Thundercats size cases would work for what I want.
Hadn't thought of AFA selling them without grading services, but good spot.
http://www.cgagrading.com/OnlineStor...x?CategoryID=5
And the fact they're acrylic rather than thinner moulded plastic is a definite plus. I'm only going to be doing this with a small number of items, so may as well do it right.