How much would Apple buy a a APPLE IWATCH SERIES 4 Nike + space grey?

I was wondering since I have a Apple Iwatch Series 4 Alaminium Nike + 44mm Version, How much would Apple Pay if i was to give it to the store as some sort of refurbished back pay thing? I know they would give me money towards the store but I was going to sell the watch go buy an Stainless Steel version, thanks for... show more I was wondering since I have a Apple Iwatch Series 4 Alaminium Nike + 44mm Version, How much would Apple Pay if i was to give it to the store as some sort of refurbished back pay thing? I know they would give me money towards the store but I was going to sell the watch go buy an Stainless Steel version, thanks for reading & answering
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