Where to find small pieces of foam

[RobertInOntario]

I have a small N scale layout that is about 28" x 58". I'm looking to expand it by glueing on some narrow long bits of foam, ie approx 2x2" or so. (I'd like to make it about 2" longer and wider all around.)

To avoid having to buy another foam board and cutting it up, does anyone know where I could find smaller pieces of foam -- maybe I should ask at a big box store if they have any scraps or maybe there's a place where you can buy these?

This would be easier and neater than cutting up a new foam board

Thanks in advance.


Rob