buy 4 baby

imo, list them individually but offer to package say 5, 10 and 15 at slightly cheaper prices and that you reserve the right to end the listing at any time if someone purchase all (just check in t&c that you can do this)

eta: in case youre after approx postage - roughly 3 will fit in a 500gm postpack - $6, up to say 6-8 in the 3kg - $10. registerd and xpress more