Im in Norway, and foamboards locally is with a self-adhesive side, and thin aluminium and paper similarity other side, with core of XPS similarity , or laminate floor underlay,Depron/XPS, 3 or 5mm thick without any paper on.. None of them is cheap. (easy to roll though.. but not as strong as standard foamboard)
A few national public relation or office delivery shops have foamboard too, but expensive, and minimum orders.
Mainly i order from another town standard foamboard (shopname Panduro) who is a chain of stores in Scandinavia, and normally ships it from Swedish storage to here (approx 4-7 days delievery) cheaper than all others, and the "right" type.. paper on both sides and foam center. Shit is, sometimes its not possible tear the paper of, but have learned a technique with a fish fillet knife to get rid of it.