We sell these in packs online or they are available individually in store. Westfoam 5mm White Foamboard is a rigid board with a smooth finish for a range of uses including model-making and mounting. Available in sizes A1, A2, A3 and A4. Made of acid-free paper and non-toxic, recyclable polystyrene, it's light, easy to cut with a craft knife, and has been treated to resist yellowing. Size A0 is available in packs of 25 here.