I don't understand why Apple wouldn't place the 21" iMacs for sale yet when all of the components in manufacturing it is already available. While the 27" iMac is most likely having issues in supplying GTX 680MX cards, since these are new releases from Nvidia. Whatever the case may be, I really am hoping we see the buying options in the early days of November/December. I can't wait patiently after Christmas to receive it, or even worse, in January for my spec-outed 27".