I recently purchased two of these kennels:
https://www.ebay.com/itm/Lucky-Dog-6H-x-8L-x-4W-Welded-Wire-Dog-Fence-Pet-Kennel-with-Heavy-Duty-Cover/232679467087?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
As mentioned, they would need hardware cloth and an anti-dig apron for predator proofing. But still a cheap start. I didn't alter mine at all because I only let the birds out when I am home and they are locked down in a very secure coop otherwise. These kennels are a little small but you can combine them to make one larger run. I have a breeding trio in one and a quad in the other. These particular birds I recently purchased from a breeder, they were either show birds or breeders, so they were used to being in cages. To them this is the Taj Mahal.
ETA pic:
https://www.ebay.com/itm/Lucky-Dog-6H-x-8L-x-4W-Welded-Wire-Dog-Fence-Pet-Kennel-with-Heavy-Duty-Cover/232679467087?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
As mentioned, they would need hardware cloth and an anti-dig apron for predator proofing. But still a cheap start. I didn't alter mine at all because I only let the birds out when I am home and they are locked down in a very secure coop otherwise. These kennels are a little small but you can combine them to make one larger run. I have a breeding trio in one and a quad in the other. These particular birds I recently purchased from a breeder, they were either show birds or breeders, so they were used to being in cages. To them this is the Taj Mahal.
ETA pic:
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