I think if gear is newish , ( under 10 years ) , in perfect Nic , and exactly what you want , half price is the max you want to spend .
We have the buying power because windsurfing is out and kiting is in.
Windsurfing is harder and better than kiting.
Saying that you should be able to buy perfect second hand modern sailing gear for one third retail.
Ask other sailers , or forums , as to what you need .
Tip , under estimate your skills , go big board small sail combo.
Enjoy ,
Then you will have your own opinion and your hooked.
Welcome to windsurfing