Easy George... Myself, I've never seen cardboard mounts from a pro-lab, even when I go back through the stuff my Mom shot when I was a kid (about 20 years ago). I think Håkan was probably just surprised at the cardboard (as am I), and as he's likely not a native English speaker, perhaps it's not coming across as he intended?
Here in Germany, I can get chrome processing done locally at Foto Gregor for 2,50€ without mounts. I don't know the price with mounts, as I never have it done that way. However, with every roll of chrome film I buy, they give me a certificate for free processing... It feeds upon itself, it does!