I'd like to buy a new lens from my local camera store and I know they sell used gear. I'd like to trade-in a lens that is in excellent shape (practically new) and includes the box, all original packaging, etc. And, the trade-in lens was purchased from the same local store (I think the receipt is still in the box).
How much should I ask for the trade in? (as in percentage off the purchase price?)
MSRP on the lens is 499.99
Ebay used have sold for 350 to 390


