Have thrown one away which was the Uboat. Just hated that
device. Another I thrown away was one of my Infinix as it bent in my pocket and even though it is a small device, it is still a battery and I didn't want to take a chance. I sort of grown accustomed to my fingers, eyes, teeth, nose, and stuff like that and a $15 device didn't seem worth putting those at risk.
Have retired a few which include:
Exceed Edge (x's 2), Icare Solo, T20, a bunch of Myblu's, and the Minifit seems to have hit the retired bin even though I liked that thing for a while.