It's still not available in exchange because this is still a testnet.
IOST, IOTX, ZIL, THETA, ENIGMA, QLC, AE - those are only few coins out of dozens that was listed on binance, priced 60M $ - 1,2B $ while still being in testnet.
You can buy/sell IDENA on discord OTC:
https://discord.gg/UjBAmz (official discord chanel)
https://discord.gg/Vrzvkwq (OTC escrow service)
Current price ~100-250 sat.
I already know about it and most in the discord group many people are trolled by selling idena at very cheap prices. It is better for me to wait until the exchange is truly safe besides certainly the benchmark selling and buying prices are more real.