I almost sent my IPhone5 in .. but I bought my One from someone who won it and I never got a receipt.
I sold it for $550 on kijiji instead.
All in all I worked my own "trade-up" plan.
My One was $475
+ $25 for antiglare ghost armor screen protector
+ $25 to unlock
+ $20 for HTC hard case
+ $5 for a new SIM
= me breaking even ;-)