.GR.COM domain name registration starts today (all around the world) at 4:00 PM (Paris time), when you will be able to get yours at Gandi.net.
For A rates the extension costs €16 ($19, or £15) excl. VAT, and E rates will get you your .gr.com domain for €12 ($15, or £11) excl. VAT.
You can see all the prices for this extension at