I would say (through my recent experience chasing early 2000 kooks) up to $40 individual or up to to $45 each from a dealer. with ebay you could try your luck at "rare 2003 silver kookaburra 1oz " $130 like some are doing with the 07 08 koalas lol,hey someone might buy one at that silly price lol.
But to be honest if somebody is chasing a 2003 they will pay $45. but maybe not on ss.