I used PVC 1/2 on pipe...zip ties.....nuts and bolts.....locks.....and plastic hardware mesh!!!! It's pretty strong I have chewers and they have not chewed it at all.....they have lots of toys to keep them engaged....
Ace hardware and Home Depot.....I was told lowed is cheap in some supplies but its too far of a drive for me since ace was right down the street....and Home Depot was only ten minutes away......I kept it around 120 or less