What's the cheapest thing you had bought that by the end of its usefulness made you say "wow, this was worth a lot more than what I've paid for!"
Mine... My Xbox 360 slim only costed 129 euro back in 2012 and to this day still work like brand new, you would think that the disc drive would stop working but no. Never had the need of open it or clean it's insides. Still great, I just don't use it anymore since I feel it's outdated and loading speeds are better nowadays.
I'm still loving my iPod Classic. I got it a little Bluetooth dongle so I can listen via my hearing aids. I find iTunes beyond irritating though and am always looking for an alternative for adding music.
Back in the day, I installed Rockbox on mine. completely eliminated the need for additional management software, just drag&drop my music via a file explorer.
I still have my SanDisk mp3 player for audiobooks. It feels more straightforward to use for that purpose and the battery lasts for like 3 days of listening and is lighter than my phone.