Last I heard, the Pop's Car Rentals only offered 1-way with low pick-up fee to/from locations in the Argolid section of the Peloponnese, plus its nearby islands like Spetses & Hydra. Recent posts on this topic have said that some of the bigger international car-hire companies are doing better on this score, such as Avis, Hertz etc. Dupree, the reason local company have to be quite pricey for this service is simple if you just think about it ... Greece is not like USA. They do not have huge fleets of cars based all over, constantly moving from state to state or even across the country. Therefore, if you take a car from a small Thessaloniki company and drop it in Athens, the company has to send a SECOND car, with TWO drivers in it, to fetch your vehicle... at the very least, an all-day task, not to mention the road miles, petrol, tolls, and salaries. So, no wonder!