Would like two beds that can be made into one for our guest room.

Hi. I have one of your medium super king mattresses (Artisan bespoke 002) and I love it. We have a well used guest bedroom with two old singles. I would like to explore getting two mattress that can either be used separately or pushed together with a topper over the two. Therefore, the bases also need to be separate. I would like them to be super king when combined. What size and price would this be pls?