Viator, an affiliate that offers many short tours in Greece that are ideal for more independent travelers, is offering a 5% discount this weekend on all new bookings.
If you're wondering if the Euro is going up against the dollar in the next few months, you may like the thought of paying for part of your trip upfront in today's dollars. Tours from Athens include a winetasting trip to Corinth, and a two- or four-day excursion to Santorini, plus many others. They also offer sightseeing tours on Crete and many of the other Greek islands. You can also book more basic offerings like pre-arranged airport transfers.
To get the 5% discount, use the discount code TURKEY5 which must be entered at the time you make your booking. The code is good from Thanksgiving, November 26th, through Sunday, November 29th, so it is not good for purchases on "Cyber Monday".