Boy, that's a stinker! Meeple People is a good place to find them, but are extremely slow to deal with... at least from what I've heard as I've never dealt with them myself. I have emailed them with questions though and never gotten a reply.
Take a look at THIS
website. They also sell lots of 100 mixed for a pretty reasonable price. I'm quite sure you'd have enough to make 5 sets of 8. You could the extras for fan-made expansions if you wish. I think I read somewhere on that site that if you live in the states, you can also get all their stock from www.boardgamebits.com
, though they don't advertise all that merchandise.