JeffOpsal Depends on condition but, for ‘excellent’ condition I’d think 50-60% of its original retail price, depending on local market conditions and how long it’s been used.
So the 128GB/8GB retailed for $599 USD at launch, I’d pay 240 - 300 USD.
Would I purchase the NP(2) is it was the same price of the NP(3a)? I’d probably go for the (3a) but, depends what you want:
Choose the Phone (2) if you want more premium build quality and slightly better performance
Choose the Phone (3a) if you want longer software support, newer hardware and features like Essential Space