Euphonium or Baritone?

Great Euphoniums to Purchase

NEW or USED 1) Yamaha, 2) Besson, 3) Jupiter Euphoniums. Bach, Conn, Holton, or King Euphoniums will also work.
...or... Rent an instrument from Robert M. Sides

Valve Oil – I recommend getting either Blue Juice, or Al Cass Fast valve oil. I have personally used both of these oils, and they're both outstanding!
Tuning Slide Grease – this Venture Grease is great and also the easiest to use because it is in a small tube.
Polishing Cloth - polishing your trumpet every couple of weeks will keep it looking new for a very long time!
Mouthpiece Brush – you should brush out your mouthpiece once a week with soap and water. This special brush will help you to clean the entire inside of the mouthpiece.
Snake Brush – use this to clean out the inside of the pipes. If possible, this should be done with the instruments under water.

Bach 6-1/2AL Mouthpiece – this is the most highly-recommended baritone mouthpiece. Do not waste your money on other cheaper brands of mouthpieces, they are not the same as a Bach and they are cheap for a reason. Note: you need to check if you need a Large Shank or a Small Shank mouthpiece. If you get the wrong size, it will not fit in your instrument.