I found an art shop that sold me A2 paper. All I had to do was go through the whole 120 sheets and put 1 inch lines (start from the back and its just tracing =D). Once you're all done, use a sharpie or thick marker to draw the maps and details. At 16 inches long and 11 wide, it fits most maps. I really enjoy breaking out the colors and going into detail for my players. This tactic has replaced my use of lots of tiles.
Anyone who wants to do it room by room. Cut it out and place it as they go. Anyone wanting it to look better, cut and glue it to a matte-black board for depth.
For the price worried, use A3 or simple A4 to trim cost.