Skip Pottery Barn: Lullaby Earth $239

It's your last chance to get a rare discount on the Lullaby Earth Breathe Safe Baby-to-Toddler Mattress with code MEMORIAL20 at Lullaby Earth. It drops the price from $299 to $239.20, so skip the $300 price at Pottery Barn Kids! This is an expensive baby mattress, but the features make it the only mattress you'll need for several years. It's known for its Breath Safe fabric, which provides infants with 360-degree air circulation while they're sleeping. It's also EWG-certified, so it's free of harmful materials and offgassing commonly found in low-priced mattresses. The mattress is waterproof but also includes a washable cover (with most baby mattresses, you'd need to buy this separately). All of these features make it the gold standard of baby mattresses: non-toxic, extra breathable, washable for easy cleanups, and able to be used through toddlerhood. Shipping is free.