I have about 2 quarts of finely ground egg shell. I run them through my coffee grinder.
My use for these is gardening, as a calcium amendment for tomatoes and green peppers and also as a soil Ph adjustment to make the soil more alkaline (higher Ph).
I've much more than I need for my window sill garden space, so....l
These shells are NOT roasted, although that is an option you may want to use.
FYI Egg shells are about 98% Calcium Carbonate and can be used in the same proportion as garden store Calcium Carbonate soil amendment. I use about 2 teaspoons full of the egg shell powder PER PLANT, mixed into the soil.
What do you have to barter?
PS: These are probably NOT something I would feel comfortable shipping (white powder in a container...) So local Reno only please.