Hitbtc is one of the popular exchanges. You can also try Idex, which is way better than Etherdelta. Forkdelta is not even a trusted site.
While Envion price is low they should pay bounties so people dump for cheaper price. Then we can move on to Binance or Kucoin exchange.
I have not encountered with any problems using Forkdelta, just make a separate address. HitBTC is trash, I agree. I doubt there will be many willing to sell their bounties because this is a dividend token. However volume is incredibly low, something you would not expect from a top 6 ICO.