Buy if You Like The Current MacBook Pro Deals
Right now the only real deals on the 2019 MacBook Pro are for students and teachers or with a trade-in of your old MacBook Pro.
Apple offers $100 to $200 off the MacBook Pro for teachers, students and faculty members. This allows you to buy the new MacBook Pro at a discount, but not a major one. You do need to meet the requirements, but they are pretty lax, including being the parent of a student or attending college in the fall. It's part of the back to school Apple deals.
There are deals up to $300 off the 15-inch MacBook Pro at Amazon, including on the Intel Core i9 model.
Apple also offers a trade-in deal that the website says will give you up to $965, but they offered us $1,035 for a 2016 MacBook Pro. Check it out, since you may save more this way and have less hassle than selling on eBay or Facebook.