Are there any sites for selling iOS apps?

I have an iPhone/iPad app that I've built and I'm looking to sell it and move on to other projects. The app makes good money (between paid and free versions w/ ads, around $10-$30/day over the past 4 months, and has pretty good reviews.

It's a matter of changing interests, and lack of time/budget to make the improvements I'd like to.

If interested, the app is http://zazensuite.com/iOS - there is also a Mac App that should be live this week.