Audio books for iphone/ipad?

I have kindle on iPad but I know audio books don't work on it. I'm trying a free month Audible but on top of $14.95 then I have to pay like $15.00 for a audio book. Is there an iPhone/iPad app where I pay a monthly fee and get unlimited audio books?

No, because publishers consider audio books a separate work, and so far have no "unlimited" scheme.

Try the site I'm putting a a source - They say 1 time membership fee

Have not tried it myself and do not know the legalities but they seem to offer what you require/want!

So sorry - the 2008 site looks closed but the site has an app/site update here -

https://itunes.apple.com/...?ls=1&mt=8

Hope it helps.