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 Still great, I just don't use it anymore since I feel it's outdated and loading speeds are better nowadays.
My Logitech G203 is still alive after 8 years of constant use. Never tried to fix, but it autorepaired itself of double click (both buttons) , miss click and bad contact.
At this point I am afraid of opening it to clean inside and it just cease to exist, I still clean outside tho.