Actually, from a certain perspective, an "eMac" is still available.
That is to say, when it was new, the eMac was filling in a gap in Apple's lineup below the pricier G4 iMac by taking "last year's tech" (a CRT rather than LCD) and putting it in "last year's case" (more G3 iMac like) for the educational market.
That was what the "e" stood for, after all--they just turned out to be popular among budget-minded consumers, so Apple started offering them to other users as well.
Well, if you go to the Apple Store for Education right now (institution version, not student one), click on iMac, you'll see a little tiny link at the bottom of the list going to the base old-style 17" iMac model for $899. Which is, of course, last year's model at a budget price.
So while it doesn't say eMac, and it's not available to consumers, the slot the eMac was originally intended to fill still has a computer in it.