There are numerous ranges at which the single sofa bed mattress is available; to local stores, to backyard sales, to online shops and auction websites.
It must be thick sufficient to provide a great assistance for the person sleeping on it. Not every house can accommodate substantial furniture.

Now, your corner couch will add up to the convenience, beauty and flexibility in your home.
Assuming that you are buying this to last, then you will want a fairly flexible item of furnishings.