You can buy at yard sales... or goodwill too.You could also just buy a camera tripod and drill a dowel/perch to fit the camera mount
Most tripods aren't designed to hold a lot of (live) weight that likes to move around and flap their wings. If you want to go this route you'll need to add some weight to the center column or to the feet as a counterbalance. In film and video they use sandbags hung from a hook in the center column, tied to the legs or straddling them like this to give the equipment more stability. A video tripod would be really easy to modify if the screw in the tripod plate was removable.and wasn't stable.
Tote Perch Folding Bird Stand for Parrots Adjustable T-Stand with Cups Free Ship | eBayI did check ebay, but nothing came up.