I have a map from the "Caverns of Doom" set, manufactured by Citadel Miniatures circa 1980.  We're only talking about the map here; I have many of the miniatures from the set, but I don't have others (some have sold) and the box is long gone.  Any ideas of what the map would be worth on its own?  (The map was a dungeon map scaled to the 25 mm miniatures in the set; it could be used in a D&D adventure, or as its own boardgame, with the miniatures as the playing pieces.  I can provide a picture.) I've seen the full set on Ebay in the neighborhood of $150, starting bid.  

Thanks once again for your help!

I once purchased the map for this set by itself for maybe $10, but that was seven years ago & prices have skyrocketed. $30 today?

Thanks so much!  Yes, I do mean the Heritage map (my bad).  I will check those links out!