I have 4 of these, brand new unopened still in original packaging. On Amazon for £18.44 each
Bestway Kids' Outdoor Inflatable Single Bed.
Sturdy pre-tested vinyl
Great for indoor & outdoor use
Comfortable flocked sleeping surface
Heavy duty repair patch included
1.32m x 76cm x 20cm (52" x 30" x 8")
£10 each or all 4 for £30.