Yeah, just did the thing to find the price. $200 for the 4S, which is exactly what I bought it for from them 2 years ago. I guess if I can't find a buyer, I have a fallback plan!
Edit: Also just checked Gamestop. $290 for store-credit. I mean, that's not bad at all. If I can't get 300+ cash, I'm doing that. Hell, I might just do that and save the hassle. I know I'll be spending money at gamestop one way or another in the future.
I sold my 4s 32 gig white perfect condition with accessories for 300. Going price around here and on ebay.