WEBBeautyrest® Black LX-Class™ Hybrid Mattress. $ 2,349 – $ 3,599. Beautyrest® Black CX-Class™ Hybrid Mattress. $ 3,049 – $ 4,599. Beautyrest® Black KX-Class™ Hybrid Mattress. $ 3,649 – $ 5,499. Beautyrest® Black B Class Mattress. $ 1,849 – $ 2,899. Beautyrest® Black BX Class Mattress.