Implementing a map exploration mechanic cheaply
There are several methods.


instead of tiles, cards. Less cost to produce.Benefit: cheapdrawback: usually not square.
a pile of larger geomorphs with just the rooms, not the contents thereof; cards by room typeBenefit: sturdy board chunks, highly flexible modedrawback: rooms fall into well known patterns
movable chunks of wall on a gridded boardBenefit: extreme flexibilitydrawbacks: component costs, setup time, easily disrupted.
laminated grid board with overhead pen, cards for what to draw.Benefits: the most flexibleDrawbacks: lots of work, lamination required.