Anecdotal reports say that Walmart does resize watches. If your watch was bought there, they can even adjust it for free.
To find your local Walmart store, use their Store Finder tool.
You can also get in touch via their Facebook and Twitter pages.
Most metal watch bands come in one of just a few standard lengths, and since people come in all different shapes and sizes it is likely that your metal watch band will be too long when you first get it.
And as most watch bands are held together in a variety of ways, you cannot adjust each watch band the same way.
Check out this collection of articles to help you learn how to adjust your metal watch band to make sure it fits you perfectly.