Hmm. I've watched a couple of tutorials on doing Coptic binding, and it looks like all I actually need is thread, a couple of pieces of book board, and paper.
I'm debating whether to buy some hot-pressed watercolour type paper (nice cotton paper) or a heavier printer-type paper (100gsm) already cut to size.
I'm tempted to go for the printer paper solely because I can't get the watercolour paper in the right sizes. I can get them big enough to cut down, but then there'll be a lot of waste.