Right now apple will give $525 on a base model X. Selling it can probably get you $100 more. For me it’s almost worth just trading it in for the $525 to not have to worry about taking pics of it, posting it, dealing with people, shipping it etc. My time is worth $100.
Can you trade your series 3 watch in for credit towards a series 4? That would be sweet!
Yes, you can, but you mightn't be happy with the offer. I think it's only 150.00 for my base level gray WiFi model.