1. Music Stores: You can check your local music store for the availability of "Lets Go Band" for trumpet. Some music stores may carry this specific publication or can order it for you.
2. Online Retailers: Various online retailers, such as Amazon, Barnes & Noble, and Sheet Music Plus, offer a wide selection of music books and publications, including "Lets Go Band" for trumpet. You can purchase the book online and have it delivered to your address.
3. Music Publishing Websites: Some music publishers may have their own websites where they sell their publications. You can visit the website of the publisher that released "Lets Go Band" and check if they offer it for purchase.
4. Used Book Stores: You may also find used copies of "Lets Go Band" for trumpet at used book stores or online marketplaces like eBay or AbeBooks.
It's always advisable to check the specific edition and publisher of the "Lets Go Band" book you are looking for to ensure that it is the correct version for trumpet.