Etherdelta or Idex. Neither are for the novice crypto user. This is a very solid project though, so it will not suprise me to see exchanges add it very soon. Look at dragonchain. It too was on ED ( You could only trade by adding the contract yourself for 1 week on etherdelta, the same as TAU now) and no novice users knew they could trade it until etherdelta "added' it to the list. It had 1 million in volume the first day it was there too. Lamden is pushing 2 million! Hold your Lamdens... They will be Lambos soon :>