If someone has to go that cheaper, I don't think he prefers keeping those phones with him.
$35 isn't a good amount for the iphone 4s, you may get 3dummy phones at that price
Or stolen ones
, But serious OP you need to offer a better price if you like to get serious offers!
Fuck that shit, I've been to a black market a few years ago, most of them sell stoled ones and some are bought from chinese market, yet for the used shitty(not iphone, sony erricson and forgot the model) he asked more than what OP is offering xD