Munchkin White Hot Safety Bath Ducky for $1.99 @amazon at its lowest price as Add-on item
NOTE: It is an add-on item. Free shipping with purchase $25 or above.
Check if ordering through alexa gives free shipping.
Same price at Target as given below in comments -
About the product
White Hot Safety Disc reveals the word hot when bath water is too hot for baby
Fun, easy to grasp size and shape
Water tight to prevent sinking, squirting, and mildew
White Hot Safety Disc reveals the word "HOT" when bath water is too hot for baby
Fun, easy-to-grasp size and shape
Water-tight to prevent sinking, squirting, and mildew