No, I didn't added the Etna suggestion, yet.
Oh nice, there is still hope for Etna special edition 
Honestly, the raw material cost is nothing. 4€ for washers and a few euros for the stamp
Are you sure it's still 4€ in all places?I heard $5 wrench attacked is now renamed to $10 wrench attack because of inflation and price increase
Maybe it's good idea to stock up on steel washers as I am expecting price of metal to go up more in future, and you can always use them in real life.