I would be interested in coordinating a buy of 100 bags if we have enough interest. But they charge a few dollars S&H I think and then I'd have to ship it out which might negate any benefits. All up it'd be around 10-20 cents extra per bag if I bought 100 and shipping it out at $6.50 (assuming 10 bags < 500g). Quick check on aus post website says $1593.00 + $2.95 for registered for 100 x 3kg bags. I would then charge $6.50 to post out so that's 2.95 cents + 6.5 cents per bag extra if we did a group buy. Still cheaper than buying only 10. Cost of buying 10 from Auspost website = $17.11 per bag. Cost of buying 10 from a group buy of 100 + $6.50 shipping from me = $16.6095 per bag. Now I just need to figure out if 10 plat bags weigh under 500g.