Makita BL1830B-2 18V LXT Lithium_Ion 3.0Ah Battery, 2-Pack for $87.99. Price is shown in cart and shipping is free (to hawaii, which means everywhere else too). reputable seller and official makita batteries.
Save about $10 from the cheapest option I found on amazon which goes for 97.50 with shipping included.
https://www.ebay.com/itm/382310498701
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