Musescore's online community has lots of transcriptions people have done of these types of charts. They're free to download, and you can get the musescore file (or, I believe, musicxml if you use different notation software) and then chop up parts and switch around instruments to fit your group's needs.
I love Youngblood, and Nat is an absolutely incredible sousaphonist, it must be a joy to play with him! My brass band does a cover of their cover of Killing Me Softly.Not sure about the rest, but Youngblood has published a lot of charts of their own music. My buddy Nat is their sousaphone/trombone player (also plays with another brass band that I'm in). I think he did most, or all of the arrangements. I believe they can be purchased through their website (see the 'education" section).