If you absolutely cannot pay, search Google for and look for edu domains (university sites sometimes have single pages for class use), but don't expect high quality.
If you are looking for general trumpet pedagogy materials available in various formats, these established methods are often used alongside or as alternatives to Suzuki: Suzuki Trumpet School, Volume 1: International Edition metodo suzuki para trompeta pdf high quality
Developed over 12 years by the International Suzuki Association's Brass Committee, this method emphasizes: : Suitable for children as young as age four. If you absolutely cannot pay, search Google for
The Suzuki Repertoire consists primarily of public domain folk songs and classical themes. While the edited Suzuki book is copyrighted, you can find high-quality PDFs of the individual classical pieces (e.g., Bach Minuets) for free on IMSLP. This is great for supplementing, but it is not the complete "metodo." While the edited Suzuki book is copyrighted, you
Because the Suzuki Method relies on specific pedagogical techniques, working with a is highly recommended. You can find training resources and directories through: Teacher Development - Suzuki Association of the Americas