Amazon has a 2-pack of Colgate Baby Toothbrush and Teether (https://www.amazon.com/dp/B07K3LZ7WH?tag=quackdeals-20)for just $6.36 (originally $16.56). Free shipping with Prime or on $35+ orders.
(https://m.media-amazon.com/images/I/81pCrJsQqSL._AC_SL1500_.jpg)