Little known fact, luffa is a plant. You can grow them, let them dry, cut them in half and they're perfect. One plant is more than enough for two people to change them out monthly and you can just compost it when you're done.

So they're from my back yard. Bonus cuz they have beautiful flowers and we just come them over a cattle panel and it produces enough seed from one fruit that you will never have to buy seeds after your first year.