Is there a journal that publishes slides together with the text?
I don't know of any such journal.  The closest I've come to this is that often after I've listened to a talk, I've asked the speaker for his slides.  I can't recall ever being turned down.  Alternatively, if you can't attend a talk, you might still ask the speaker for his/her slides.  This request will likely be a bit more successful in person, but even via email it can't hurt to try.