What's the most i can get for a iPhone 4 32gb on Verizon?

I'm going to be getting a new iPhone 5s soon and was just wondering which website or place would be the best to release my iPhone 4 to? It is sort of water damaged and by that i mean the cameras don't work. Only when i FaceTime then the front camera works. Also it is really slow and goes what i call "mental" a lot! So annoying! Other than that i mean it works just not very well.
BONUS- wheres the cheapest place or website to get a GSM unlocked iPhone 5s 32gb?

IPhones are useless. Convert to Android and get Note 4 or a Nexus.

It's not worth anything in the description you just explained. A new unlocked 32gb iPhone 5s is going to run you over $500. You should look into used ones on eBay. Make sure the seller has good reviews and it says CLEAN ESN.