I did a bulk order from Staples (£100 minimum). Black card over white core was the only choice for masterboards, although they did do some A4 black on black in the kiddies craft section.

Both are 6mm thickness, which I've found perfectly adequate.

I was told that Staples don't do the bulk orders any more, so if you find a good online supplier - please tell me.

Speaking of working with foam board, has this tool been mentioned before?



It can make a 90° cut and a 45° cut.