Space issue: white reflective tile board alternative?

I know the white reflective tile board you can get at large home improvement stores. I actually used to have to of these boards but they got wet when my basement flooded and I haven't replaced them yet.

I don't have a designated studio space and the 4x8" tiles are a bit cumbersome to a) bring home and b) bring them up from the basement each time I need them upstairs.

Not to speak of anything for location shoots.

So I've been wondering if there is any cheap and easy alternative such as any PVC canvas or anything else that could be folded and still work as a flat shiny white surface without wrinkles.

Thanks