I work for DirectBuy, so I kind of specialize in finishing products, In terms of access to cost pricing for such things.
Meaning: Windows, siding, doors, Flooring, Cabinents, countertops, fixtures of all sorts, Tubs/showers, window treatments, paint, etc etc...
The people that I work with most often are those who are building or renovating.
Let me know if you'd like more info.
/sales pitch.