Want filament? Add it to the wishlist — there is always one open, so there is nothing to start and no rush. Then when someone is putting an order in, they order everyone's at once, which is how the bulk discounts get earned. Closing the round works out what each person owes, discount and postage included.
Prices come from the store, so nobody types them in. A five-digit code is the number on the spool — checking the colour index…