as others have said, windows, some doors, garage doors, any specialty vinyl soffits, plumbing fixtures the list goes on and on. we are currently looking at average of 8 month lead times for "ordered" products.
under ground wiring to the house site can be around 10.00 a foot once over 200 ft. plus conduit if it is the road way. road grading is easily 80-100 dollars a foot. well i would budget 10,000 same with septic. You can easily spend 75,000 to have a pad for a place and a road to it depending how far off a road you go.
i also think youd be hard pressed to build a house now for under $200 sf.