For All 7th & 8th Grade Students Looking to Upgrade their instrument, click here or here
Trumpet Upgrade Purchase Option Here and Here and finally Here
Used Trumpet Upgrade Here
If you plan to do marching band in high school, I recommend keeping your beginner student model instrument or purchasing a used cheaper instrument to march with (but still a quality brand so it'll last and withstand wear and tear being outdoors).
For mouthpiece upgrades, click links below.
Trombone/Baritone Small Shank Here or Large Shank Here (large shank for trigger trombone)