There is also a "Plus 2" with 2G of ram, wireless and 1000 Mhz ethernet. It also has 16G of eMMC and a SATA interface of all things. But it costs $49, so never mind. The SATA seems to push the price up.
I ordered two "Plus" boards for $20 each, they arrived 12-12-2016 (taking less than 2 weeks!).
Tom's electronics pages / tom@mmto.org