If you're in the states check out Lowes, Home Depot or any building store. If you know anyone in the construction business maybe ask them if they have any extra or where they get theirs from (maybe can get a deal)?
"Because she's the hero they deserve, but not the one they need right now. So, they'll hunt her, because she can take it. Because she's not our hero. She's a silent alcoholic. A watchful booze hound. A drunk knight." -TechnoPotamus
"she just partied for a week straight in a dress and sombrero." -Rossik
in the staging industry, we use schedule 40 steel pipe. not really sure where you can buy it tho. i'd check out some commercial construction companies or something. not really sure if home depot, etc would have stuff like that.