Just back from Asda Grangemouth and at the front of the store they had a trampoline and enclosure for £99.
I am not exactly sure of the size as there was no accompanying description but it was at least 10 feet wide.
The trampoline was actually called a Bounce Mat and was extremely sturdy looking with the outer rim being green instead of blue like most trampolines are.
They were sold out n Grangemouth but there were 10 left in Livingston if that helps anyone.
I can't find a link at Asda online unfortunately or some of the £10 or free delivery codes might work - let me know if anyone finds it!