I can pay 2-3$ for 6 month key, 10$ for 1 year. I can only pay with Paypal. I don't care 1 or 3 device. 1 is enough for me.
if you change the payment into bitcoin, you can buy it only $2 / year
it's cheap bro
https://bitcointalk.org/index.php?topic=1287212.msg13231476#msg13231476