why are interior doors so expensive- and where can I get something reasonably priced?

I need 2 different types of interior door. French doors for my bedroom because the doorway is oversized and of an odd size, so nothing else will really fit there, and 2 sets of closet doors- 1 for the closet in the bedroom and 1 for the closet in the living room. The closet in the bedroom will more likely then not have to use the closet doors that run on a track- the ones with the slats in them. I think they are called bifold doors. The closet in the living room will probably have to use this type of door as well, it's another one of those oversized/oddly sized doorways. All the major stores (home depot, lowes, etc.) seem to be asking hundred of dollars for even the most basic door, and I haven't been able to track down bifold closet doors at all so far, though I admit I haven’t been looking long. Any suggestions on where to go to get reasonably priced doors of these types in Brooklyn NY or somewhere close by? Thanks!

Answers:
I just looked at Home Depot online, and while the doors are a couple of hundred dollars, it's really not that unreasonable a price.

They have a mirror bifold for about $161 - it's really a good price. Here's the link to it. Can you combine floor length drapes and window shades on different windows in one room?
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