Welcome.Well that sucks, waited so long. Thanks anyway.
What does 6.1.3 or below get you these days? A specific jailbreak?If your current iP4 is running 7.1.2 then I agree- $50. trade-in is decent.
If it's running 6.1.3 or lower, and you feature it as such on eBay- you may be pleasantly surprised how it'll garner you a bit more- especially so if it is in great shape.