Love Arcknight's work. Their Fantasy Map Pack is 140 11x17 maps on 70 dry erase pages and they will print any grid you want on each map. Even built a special print file for me to place squares on all interiors and hexes on all exteriors. The Flat Pack Miniatures look to be another home run but the artwork is taking a bit longer than I would like. I love the idea of cutting out individual items (street, buildings, trees, rivers) then laying them however you want and placing a single, unified grid over the whole thing.
11x17 clear grids are nice. I think I'll ask if they can do a 3'x5' sheet to fit in the well of my games table.