Update 11/20/22: Deal is back at a new low for $79.99. Previous best price is $84.99. Amazon only at the moment.
Amazon and Bestbuy.com are selling Apple AirTags on sale: (affiliate links below)
Compare on Apple for $99. Especially interesting is if you can stack and additional savings with one of the Amazon shop-with-points deals or get an additional 10% back on Bestbuy with the Chase Offer or save at Walmart with the Amex Offer.
If you bought it last week at $89, you should be able to return and repurchase now if you want to save the additional few dollars. Or cancel if it hasn’t yet shipped.