Is there a list of iBookstore aggregators?

I would like to publish a book on the iBookstore.

I know about Smashwords; but, I have a book in Adobe's InDesign and would like to export am ePub file directly from it. Smashwords only accepts MS Word files. I had found an aggregator that accepted ePub files, but I do not recall the site's name, now.

Does anyone know of an aggregator that will accept ePub files?

Thank you!