The only way you can get an eMac now, if at all, is by doing an institutional purchase - no individual users can buy them.
I have to say that the eMac probably won't be missed very much - not by now, that is. I suspect that people only really bought the eMac in 2005 if they were a long-time Mac user or someone else in love with all-in-one but unable to afford an iMac. Everyone else already knew where they were going: the Mac mini is ultimately the cheapest option, and the iMac G5 has always been a better machine overall.