> you can buy it right now for a known public price
Huh, the HiFive Unleashed has a "buy now" button on the website. I thought it's still in crowdfunding stage. Nice.
> almost to this day
PINE A64 was kickstarted in december 2015 with a known public price of $15. The RPi3 and SoftIron Overdrive 1000 appeared in 2016, SolidRun MACCHIATOBin in 2017, and various Rockchip RK3399 boards (and Chromebooks!) are shipping this year.
Oh, and you could buy an iPhone 5S back in 2013. No standard peripherals on that one though :D