I would pay in the $40 to $60 range, maybe and it sounds like you could not put together miniatures and dungeon together for that. However...
I would pay about $40(US) for a module that included a 1' scale map of the dungeon, in sections so each piece can be laid down as needed(think something like MK dungeon tiles, but a bit larger). with secret doors etc not shown, so that an additional tile can be laid down when they are discovered. Match this with a complete set of thick cardboard token with monster on one side, usefull DM info on the other(name, room appearing, hp) one for each monster in the dungeon(so I don't need to reuse them, if the tribe has 31 orcs, I want 31 orcs. Yes that would be importaint to me for this sort of thing. My PC's could hang on to the tokens for bragging rights, EPs). If you included a dry erase marker, or crayon(thinking rail baron type surface) that could be used to modify the map, and some cardboard treasure(I like having a physical object so there is no confusion over who is holding certain importaint items) that would be cool too. Though I doubt people would use them, I would include a PC group with cards or sheets for the players. while I am daydreaming, include a book of pictures a la Tomb Of Horror.
Hope that helped