I've been doing a lot more electronics repair recently.
Second monitor wouldn't power on/intermittently. Went on eBay and found someone selling the main board from a unit with a broken screen. $30 which saved me from buying a $170 new one.
Soldered a new switch onto a $50 mouse for like $5
Ordered a nice keyboard with hotswappable switches, had 4 broken solder joints once I put all the switches in. Not sure if that was me or bad QC but I didn't want to wait 6+ weeks for round trip return to China so I opened it and was able to resolder all of them and it works perfectly.