>>540137>the cheapestGet some egg cartoons out of the trash of every store you can and pin them with tape in every unoccupied space of your walls, and maybe on the ceiling, too.
Use the reminder of the tape to cover the frames of your windows and doors, replacing it whenever you open them.
There's the cheapest way to soundproof your room. Not the best of them, but still effectively, considering you're just buying a tape and using garbage.
I learned about that when I was 7 and I can't believe I finally have a use for it.
