Make your own.
Find an image of the patch you want, copy it and paste it into Word. Resize it as needed.
You can either print it on white inkjet decal paper (seal the image after the inks dry) and apply like a decal or right onto white paper to be applied with thinned white glue. Again, best to seal with microScale Decal Saver Film.
When printing, set your printer to the highest resolution by going to File/Print/Properties/Print Qualities. If using the more current Word iterations, go to the Office Button (upper left) the Print/Print/Properties/Print Qualities.
Even modest printers will allow you to see detail in 1/35.