If you play Splinterlands you will definitely know DEC. I have tried and researched various ways on how to buy DEC proper way. My research landed me to cub finance. Of course you can try buying p2p on discord but that will be a bit risky.
If you dont know about Splinterlands you can signup below and find out. Its a gem
https://splinterlands.com?ref=faz007
Cub finance allows exchanging various crypto or stable coins to DEC.
You can also stake the DEC as well
I hope someone else who has been looking all over places like me finds this post useful