Amazon.com: WayPonDEV NanoPi NEO Core Open Source Quad-core Cortex-A7 1.2GHz Allwinner H3 Single Board Computer Onboard DDR3 512MB RAM & 8GB eMMC Run Ubuntu Core and Armbian System (with Pin Header) :
Samsung 512MB DDR RAM PC-2100 184-Pin DIMM at Amazon.com
HMT164U6BFR6C-G7 Hynix 512MB DDR3 Desktop Memory
Amazon.com: NanoPi NEO Air Open Source Quad-core Cortex-A7 1.2GHz Allwinner H3 Single Board Computer DDR3 WiFi & Bluetooth 4.0 Run Ubuntu Core and U-Boot(512MB RAM+8GB eMMC) : Electronics