Grille Source

[Tom]

I've spent too much Dilbert time looking at the ceiling from a cubicle, and noticed that the 2' x 2' drop-in air ducts of the HVAC system have very nice metal grilles that are made of similar perforated sheet material as others I've seen here, and could be reduced in size and used for a DR2x0.

Beyond taking them down and using them, I've unsuccessfully searched for a source of drop-in ceiling ventilation panels.

Any ideas where I could find these as scrap? Seems like a very cheap source of 23" x 23" grilles for some of the speakers built here.