Cheapest I have seen for a S905X box with 2GB RAM for a while now, and in stock in the UK with Prime delivery as well. Details from Amazon below.
Amlogic S905X Quad Core Cortex-A53, Android 6.0 OS.
2GB DDR3 and 16GB EMMC Nand Flash, also support Micro SD Card, up to 32 GB.
Support 2.4G/5G Dual WIFI Bands and 100M Ethernet, offering highest speed,without buffering.Built in bluetooth 4.0 and HDMI output,comes with IR remote.
4K 60fps display, 4K x 2K H.265 hardware video decode and 4K x 2K output.
Make your tv into smart tv, just enjoy it!