How much can I get for a used Iphone 5s that powers on and works/charges but the upper LCD screen is cracked?

I want to trade in my used Iphone 5s for cash but it has cracks on the top of the LCD screen and the top black plate covering the camera lense is missing. Are website like Gazelle.com and CashIphone.com good sites to trade my Iphone to? It is a 16GB space grey and the carrier is AT&T.

Maybe $30.