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.
Don’t waste your money on voodoo tweaks (cable trestles, audiophile fuses, quantum/crystal/cryo/graphine/bullshite).
If you are handy, you can build very nice speaker cables, interconnects and line cords with readily available premium wire and terminations for a fraction of what a preassembled “exotic” cable goes for.
Likewise, making your own sound absorbers for room treatment is another way to save money. There are DIY videos on youtube for all of this.