Just announced today and cheapest deal anywhere yet for an Apple Airtag 4x pack MX542ZP/A, assuming you have Costco membership that is. Comes to approx $33.24 each with free delivery.
Comparison to other retailers:
* RRP $149
* Apple EEP $134.20 (inc. free engraving)
* Costco $132.99
* Officeworks (choked out, withdrawn)
Nb. Does not come with Airtag holder accessory, so use your newly acquired free ring sizer to measure up an appropriate carry buddy.