Bron, why don't you start a Trade-In/Trade-Up program to recover the smaller bars?
ie. swap 3x10oz for a 1kg, or 3x1kg bars per 100 oz bar.
It costs you a few ounces on the swap, but thats the incentive to give up all my lovely shiny kilo bars to you :P:lol:.
You get the smaller bars back...