fold-able run?

im trying to look for another run for the buns they have a run already attached to there hutch but i thought it would be nice to make a extension the only thing is i need a foldable run with a door on the side so i can attach it to the other run i can find one anywhere anyone got ideas?

ebony has a folding metal run we use for camping i got it fron bunnybuisness it has a door on the side and on top dont know if it's any good for you worth a look hers was £30

thank you ill have a look thats very cheap too!