This map pack is worth way more than a dollar. Considering you get about every possible format you could possibly want for a pregenerated map; gridded, non-gridded, JPEG, PNG, and more, you are getting some serious bang for you buck. Pun intended. Not only that, it's like this guy read my mind and included the MapTool file to import directly with objects, light sources, and vision blocking. You also get the objects and everything. $1 is a steal. You are stealing by downloading this for $1.
This particular map is a wizards tower with multiple levels. Of course, you may only want to use it once, but hey, rearrange some stuff, add a few tweaks, and boom, you're good to go several sessions down the road. Because it's so flexible and easy to use, you can really do a lot here and in fairly short order.