Amazon has the best trade in price for the 4. The white is higher than the black, but perfect condition for the 4 32GB black was $290 yesterday. It has since dropped to $275. It was $246, and not $232 for Good. My fine is in near perfect, so it is in the good category. Everywhere else was quoting me $185-220.
I would lock in a quote now for whatever you have, and then if you sell it for more elsewhere, just cancel the trade in. You have until the 19th to ship to Amazon if you lock in a price today.