You know, the small things that can save you a lot of money. I’ll start:
You can get “hospital” powercables that are completely shielded for 20 bucks or so.
You can get anti vibration pucks for washing machines instead of spending 10 times that on the same product which is just labeled as “speaker pucks” instead.
In terms of saving money on speakers - getting married
Bought my speakers before getting married. Lost the house in the divorce. Laugh’s on her, I still got the speakers.