
I haven't checked but you may find something suitable on Ebay (you can buy most things there lol). Perhaps buying two and linking them might work - we had some 4 X 4 panels that I used to link with our conventional ex-pen to make it bigger. Alternatively put the puppies in a crate(s) while you clean the ex-pen?
ps I'd not buy anything until you know how many puppies you are dealing with!!