I'm going to have some Tile Trackers (https://www.thetileapp.com/) available late this week. The postage is a flat rate so I made the most of it and took advantage of the 40% discount for buying 12 of them.
I'm going to keep six, so the other six are up for sale for $29 each. P&P will be $5 for a courier (same price for one or all six) - rural may cost extra. I think this is a fair price, they cost me $27 each and if you wanted to buy just one, the cheapest place I could find was $38+P&P on trademe.
They're still in transit to me, so just confirm your interest and once they arrive (the weekend?) I'll be in touch.