We bought some joining balls and excellent canes on Scramazon last year Charl. The canes were the best we'd ever bought, and in fact were occasionally too thick to use easily, so I had to sharpen them to fit!
The balls are pretty versatile too, and have withstood most of the winter wind, but the frame got clobbered when the snow just built up on the net. They usually stay stuck in position!
The net is a bit skimpy, but overall, we spent about £50, and got some seriously economic cages, and we'll use them for several years.
If you want to PM me, I'll let you have the names of the companies I bought the stuff from!