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I think you can try on http://flippa.com

I heard some people like http://apptopia.com

I've used both apptopia and flippa to sell apps within the past year or so. I sold one app on apptopia for $500, the sale came relatively quickly, maybe within a week or so of posting it on the site. However, I stopped using apptopia when they decided to start charging for listings, which were $50 or so last time I checked. I would only ever use them again if I knew my app was going to fetch a certain price and not just $500 like the one I sold did.

I also sold a bunch of apps in a group on flippa a couple of weeks ago. The interesting thing about this was that I no longer had the source code for the apps (so all I could offer was transferral of ownership in the app store), but even still, what I thought would only sell for $150 or so ended up going for $550.

I'd say both are great websites to use.

http://iphonedevsdk.com/forum/code-for-sale/ looks to be pretty active, though I cannot vouch for it.

You're much better off reaching out to potential acquirers directly

Where do you sell an iOS app?