Give Fastway a call, they will happily work with you for whatever "need" you have. The only requirement being that you buy in sets of 20 bags in whatever size you wanting (25 for the DL size) and they have to be paid for in advance-ish (not sure when they bill, I always pay the day I get them before I forget!).
I'm not sure what the rules are with shipping, but I've always thought it seems a bit more expensive for traders to do free shipping (assuming they build it into the cost of the item), and have TM benefit from the slightly larger commission fee. But since TM has generously waived fees, I wonder if this would be worth doing, to further promote the auctions (and make it a bit easier for people to bid to x amount KWIM?)? Of course you would need to take into account the NZPost cost in case they are rural. (I'm out of touch with NZPost equivalent costings)
If TM's generosity allows, you may want to extend the auctions to the 10 days - I've found way more hits with those extra few days (though it costs 25 c more to do that).
Good luck with the pricing - that's the tricky bit eh! (I would personally be very happy for any of my things to be put on $1R
Though of course you mix them up/group them/price them as you wish etc
You'll be very busy!)
Mum to 3 beautiful children
Small and Large pocket patterns available, for a small donation to Unicef. DIY kits also available for $5 each with free pattern. PM or email me for more info...