Apple Watch replacement

Sent my watch in to be repaired and got an email saying they will start repairs but now had updated and says we’ll replace your product and your replacement product will be shipped soon. My watch is already out of warranty. I assume they will replace my watch with a refurbished one, but they didn’t tell me how much it will cost because if it’s too high I would rather get a new one. How do I find out how much they are charging me?