What Is a MacBook Pro 13" 2017 possible trade-in value?

Click ▶︎ Apple Trade-In Here.

Just use the Link provided by Smilin-Brian and enter your specifics, including serial number and your estimate of condition, using the guidelines shown. Be honest for an honest value -- they will re-inspect on arrival.

You are Not obligated to complete the entire process. You can stop at any point along the way. if you do not complete the transaction at the price shown, remember that that value offered may change over time, and WILL change if/when Apple announces new products, which could happen at any time.