I made agility equipment for use in the garden (well, OH did
) - out of plastic waste piping from Screwfix Direct
It comes apart for storage, too
I have a cheap childs play tunnel, that lil'bit has grown out of that the dogs love
you can buy "fun" sets from PAH, but they are expensive compared with the home made equipment and not much more robust, and the professional wooden sets do cost a lot but withstand a lot of wear