Hi Daza,
You don't need the email - the £100 per person is already taken off the price on the website (notionally!). However I think even Einstein would struggle to work out the algorithm that sets the Olympic prices and daily fluctuations.
If you are waiting for your late deal, I have noticed in the past that when the Germania flight is full (or no longer running as in October from Manchester), the cost gets more expensive the closer you get to the date, presumably due to the scheduled flight companies' policy of putting their prices up for last minute travellers.
The supplement for the Germania day flight from Manchester is high this year, but I am unwilling to arrive in the middle of the night and spend the last day roomless. At the moment the supplement for Jet2 from Manchester would have been nearly £300 pp on top of the price of the holiday!
Even though I'm jealous of those who manage to get an off peak cheap holiday, I will be philosphical. If Plakias were cheap and easy to get to, it would not be Plakias.
Arnaki