These retailers offer various mattress types specifically in the 66" x 80" Olympic Queen dimension: 5 Best Olympic Queen Mattresses - Healthline

Finding an can be difficult as it is a non-standard size not typically stocked in local showrooms. However, several reputable online manufacturers specialize in custom dimensions and carry this specific size. Top Online Retailers

A quick look at the best Olympic queen mattresses * Best firm Olympic queen mattress: Plank Firm Luxe Mattress | Skip to review. * Healthline Olympic Queen Mattress Options + Buying Guide