I can't recommend Gaming Paper's products enough and the Mega Dungeon 1 is amazing. While I don't run many dungeon adventures, the individual pieces are sturdy, double sided and completely reusable.
A fully assembled Mega Dungeon 1
Gaming Paper's products are available direct from their site or from your, hopefully, FLGS.
I'll try to post a recap soon. Hopefully our player list will stabilize and we can start building legendary characters facing epic obstacles.