The window was $130 for a 5ft x3ft replacement window, that was a great price from shopping around.
The plywood at that time was $28.99 a sheet for 22/32nds plywood, I cant remember exactly if it was 10 sheets to build it with some for a very big Retes Stack and 1-2 4ft pieces left maybe. A similar number of 4x8ft sheets of FRP at $31.99 a sheet.
$25 or so for paint, around $50 for FRP adhesive and other adhesives. Note the FRP I saved by not covering the inside top, I should have maybe, but it would cost more, 1 less sheet of FRP.
Next would be several lbs of screws at about $15, 4 or so tubes of GE silicone 2 at $4 a tube I think. A water dish made from a cement trough as she destroys water dishes by punching holes through them with her claws, when digging nearby, it was $10. a dumb truck load of dirt to fill this cage and a few smaller cages not including what dirt I had set aside for some of those was about $85, saves you about $55 to get 4 cubic yards at once instead of buying it by the cubic yard. This doesnt include wiring, which I had, lightbulbs which I had, light assemblies were around $1.99 each for 5, with a few spares (3) which I had to replace some that rivets tore out of since, so 8 of them, 4 heavy duty eyelets to mount the chains to hold the lights up and a few 7ft lengths of chain that holds 155lbs this and a few other odd and ends I know Im forgetting were around $25-$35, cant remember without digging out the reciepts. Paint brushes, and other things to build, spare bits, etc.
This put me around $1000, yes this is no cheap easy built cage, I made sure it was built and engineered to last, water proofed, etc. Also gang plates, some I bought and many provided by a good friend who had a bunch of them as well lots of free wood screws and other specialty connectors.
I was suggested to frame it and use OSB board, no thank you, that stuff is crap and has little to no strength in comparison for 1/2 to 2/3rds the price of plywood. It wouls till be close or more to do it that way with the frame I believe, and alot harder to waterproof unless the frame is on the outside.
Even with spare pieces and some leftover adhesives, screws etc it still cost me a few hundred to build a 6x3ft cage afterwards.