Where to buy some 2-panel doors

[Rreemo]

I need to buy some 2-panels like this.....



...I need them prehung with the casing, two 8' (24x96) to go on a bathroom and a closet opening, and I also need two insulated 6' (32x80) that will be used to go from an interior cooled/heated space to attic space.

I've checked with both BLowes and HD...they only stock the 6' interior, and say that the insulated and 8' are special order. I know there has to be someplace local that carries these....like a builders supply. Anyone able to provide some recommendations?

TIA!

[Pooter]

Checked out Seconds & Surplus yet? theres also some other places like it with surplus building supplies, usually have some decent selections on doors/flooring/sinks....