solid, ethical vendors for wings in bulk?

hi! i do various art projects using insect specimens. right now i’m working on a set of guitar picks with butterfly and moth wing inlays but i’m almost out of spare/damaged wings. i feel bad buying a whole, usable specimen just to take the wings.

my typical vendor is local and she only deals in whole specimens. any ideas as far as where to buy single/damaged wings in bulk?

thanks in advance!