Premium audio for pennies

In a world where it's accepted that anything premium is going to cost you, I've been amazed to find that you can get some seriously good audio quality for very little. I wanted a set of cheap IEMs that I could use with a few of my devices. I've got a Snowsky Echo Mini (awesome little retro audio player that can also be used as a USB-C DAC), a few different PCs running different operating systems…