Following on from this post. They cost about £2 and took 30 minutes. The rules are right there in the discs, the stickers mean you can house rule and mess with them whenever you get bored.
Discs from www.boardgameextras.co.uk, who are lovely. Stickers are some random 25mm laser printer sticker sheet off amazon. Got hundreds of them for practically nothing.
I also did the initiative tokens, but there's nothing exciting about looking at discs with numbers on.