currently no device can beat "orange pi" if need a debian servver, the cheapest one: Zero with 256MB memory and WIFI only $6.99, should rank No.1 on cost-efficiency.
Got 512MB zero and 1GB pc from
Aliexpress.com. Both works well.
Edited 2 time(s). Last edit at 11/22/2017 10:00PM by asterix.