When looking for a case, this time I wasn't specifically looking for a card-carrying one. It's ironic that I got one in the end. There were no other satisfactory iPhone 6 Plus cases in stores here. I don't know if the 6+ isn't as popular as the 6 (unlikely) or the cases are harder to make or what.
iPhone 5 cases:
Now, if I'm going to buy a case from a shop, it has to either be "branded" or very cheap. I hadn't heard of the Korean brand Verus before, but they have a website and they're sold on Amazon so they seem pretty big.
Buttons are fully covered. Ports have individual cut-outs. They're quite small so cables with big plugs won't fit. So far I'm happy with this case.