Here is a useful auction I found on Ebay for owners of the Milton Bradley Dark Tower Board Game. Tower is prone to technical faults, so if your Dark Tower broke down here is a service that claims to repair such towers (a lot cheaper then looking for a new game)

DARK TOWER GAME REPAIR FREE SHIPPING $36.99 - eBay (item 200243507327 end time Dec-29-08 10:37:24 PST)