Check out the catalogue below, for a complete list of music and with various instrumentations of the same pieces.
David Burndrett is a freelance double bass player as well as being a popular composer, arranger and music educator. Many of his works have been sold, published and performed internationally.
Most of his scores on Score Exchange are suitable for use in schools and other amateur ensembles. There are scores for a wide range of instrumentations available so there's bound to be something available for your group's next concert.
If you're looking for something specific you can send requests to David by getting touch directly.