I have found another supplier, and in a large enough quantity it works out to about $4/kg (cheaper the more you buy), so if I steal RM's idea and get jars from Silverlock I can pass it on for $4/kg + the cost of the jar (ie $10 for a 2kg jar, $100 for Asher&Big Al's 25kg). Price is subject to confirmation from them closer to pickup.
Does anyone have any other preferred means of packaging?