How much is my trumpet worth?

Ok so, I'm getting a new trumpet. To lower the cost, I want to sell my old one. The old one is about five years old ( I bought it new), it was a beginners one. I believe it was a Jupiter CTR-6. So yeah, it's about 5 years old played 5-half of 9th grade, It has quite a few small dents and the bell has a weird dent in it too like on the bottom of it, so it's not very noticeable.. (I was in 5th grade, lol.) So, I hope it's worth something! Haha, thanks for any help!