I have a new "toy" again. It is a newly released ROCK64 - a credit card size 4K60P HDR Media Board Computer powered by Rockchip RK3328 Quad-Core ARM Cortex A53 64-Bit Processor and support up to 4GB 1600MHz LPDDR3 memory. You can boot up the card through Micro SD or eMMV module socket (better performance). There are various Operation System available from open source community such Android 7.1, Debian, Yocto and many more.
I bought this card with 4GB from Pine64 together with 5v 3A power supply and casing. I waited for more than one month to get this card.
This is a great board but the services from sales team is very bad. They don't like to reply questions from customer. No information on shipment status. If you are interested to purchase this board, don't buy through credit card. Use Paypal instead to protect your order. You have up to 180 days to claim back your money under Paypal. If you don't hear from the sales team, escalate the issue or file a claim from Paypal. By then, the sales team will reply to you.