A great value valve oil that you can easily transport in your instrument case. Not only is it ideal for trumpet valves but also covers the requirements for many other brass instruments.
The CHCTROM1 Champion Trombone case is a great inexpensive lightweight case to carry your trombone to school, rehearsals or gigs.
The Helin cleaner is extremely popular with brass players for aiding with their regular maintenance regime.
The Yamaha SB7X Silent Brass for Trumpet or Cornet. When you want to practice in a hotel room while on holiday, at home when the family are sleeping or simply for your friends and neighbours sanity, then this is a must.