1) BTCP (Bitcoin Private) I used the electrum client from from https://btcprivate.org
Sell on https://tradesatoshi.com (Currently about $60/BTC)
2) UBTC, Client from https://www.ub.com/project/wallet sell on https://www.okex.com (Currently about $16/BTC)
You got a bum price if you used okex. It's trading about 2x on exx.com. Can confirm able to withdraw BTC from there without verification.
There's a great site to see which exchanges to use for airdrops: forkdrops.io. Note, you can filter the exchange list by coin also.
I tried all the exchanges and I ended up with Okex because it was the only one that worked for me today, even now exx.com doesnt work, but you are right Okex is the worst price for UBTC, better check the others just in case they are working for you.
Feels a bit sad all these forks coming to and end, its been real nice while it lasted.
The only ones I'm waiting on now are Lightning Bitcoin (LBTC) & Bitcoin Atom