The Problem: Pre-made map tiles can be expensive and stylistically rigid while a map made of only marker lines can get confusing and difficult to read.Link: Campaign on Kickstarter
My Solution: A pack of flexible and inexpensive tapes and stickers designed to represent walls and other map elements. There's no limitations on the maps you can make and I've designed everything in such a way to be legible on any battle map but not distract from whatever flavor you as the DM have created for the space.
Link: Dungeon Tape