Thank you for that link. Unfortunately, it seems that all the top sellers on that list either
a) don't mention the Greek Cultures DLC
or
b) they specifically state that they might not have the full version of the game
For example, the first seller on the list has this disclaimer in the product description:
"IMPORTANT: Please note that FAST2PLAY pre-orders may not include same bonuses as direct Steam, Origin, etc. purchase!"
Also, the prices are higher than what is already listed in the OP