Serta Tranquility Eco Firm Crib and Toddler Mattress – Link

Amazon has this currently marked down to its lowest ever at only $99.99 w/ free shipping.

• 120 heavy duty innerspring coils Full perimeter border wire Ortho-insulated layer for support
• Convoluted layers for comfort Naturally blended cotton layer on toddler side for extra comfort Waterproof vinyl cover resists moisture and stains
• GREENGUARD Gold certified: recognizes products with low chemical emissions, contributing to improved indoor air quality Made with CertiPUR-US approved foams, which are made without PBDE flame retardants, mercury, lead and other heavy metals
• Meets or exceeds flammability, lead, phthalate and CPSIA testing and does not contain toxic fire retardants Natural cotton fire protection wrap Air vents for added freshness