Does the Lori Bed require a 10" mattress, and are these common in the USA?

This applies to the Lori Bed.

The Lori Bed accommodates any mattress up to 10 inches thick. While 10" mattresses are ideal, thinner options also work well. Mattresses of this size are very common in the USA, available from many major brands.

For best results, use the Lori Mattress, designed specifically for the Lori Bed’s lift system for perfect fit and comfort.