This is the guide I use Nordle:
http://www.ebay.co.uk/gds/Selecting-the-Correct-Size-Standard-Lighthouse-Coin-Capsule-/10000000178714172/g.html
Courtesy of AndyJack
I don't do tokens that much but I have gathered a tray full of spares from amongst job lots over the years. These are a couple of the better ones I think: