Bellow you can find some indicative prices describing the cost of living in Athens, Greece. In Thessaloniki this cost is slightly lower and moving to smaller cities can be reduced more. The information was collected from the internet mainly from http://www.expatistan.com/cost-of-living/athens-greece.

Food  
Lunchtime menu in the business district € 11
Combo meal in fast food restaurant (Big Mac Meal or similar) €5.50
1/2 Kg (1 lb.) of boneless chicken breast €4.66
1 liter (1 qt.) of whole fat milk €1.26
12 eggs, large €4.22
1 kg (2 lb.) of tomatoes €1.35
500 gr (16 oz.) of local cheese €5.49
1 kg (2 lb.) of apples €1.26
2 kg (4,5 lb.) of potatoes €0.65
0.5 l (16 oz) domestic beer in the supermarket €1.12
1 bottle of red table wine, good quality € 8
2 liters of Coca-Cola €1.87
Bread for 2 people for 1 day €0.62

Housing

 
Apartment (1 bedroom) in City Centre € 230.00-300.00
Apartment (1 bedroom) Outside of Centre € 210.00- 350.00
Apartment (3 bedrooms) in City Centre € 400.00-550.00
Apartment (3 bedrooms) Outside of Centre                           € 400.00- 650.00
Utilities 1 month (heating, electricity, gas ...) for 2 people in 85m2 flat € 126
Internet 8MB (1 month) € 18
40” flat screen TV € 419
Microwave, known brand, 800/900 Watt € 92
Laundry detergent (3 l. ~ 100 oz.) € 9
Hourly rate for cleaning help € 6

Clothes

 
1 pair of jeans (Levis 501 or similar) € 80
1 summer dress in a chain store (Zara, H&M, ...) € 32
1 pair of sport shoes (Nike, Adidas, or similar) € 68
1 pair of leather business shoes € 82

Transportation

 
Ticket for public transportation (valid for 70 minutes) €1.20
1 liter (1/4 gallon) of gas €1.64
Monthly ticket public transport € 35
Taxi trip on a business day, basic tariff, 8 Km. (5 miles) € 12

Personal Care

 
Medicine against cold for 6 days (Frenadol, Coldrex, ...) €3.42
1 box of 32 tampons (Tampax, OB, ...) €4.73
Deodorant, roll-on (50ml ~ 1.5 oz.) €4.23
Hair shampoo 2-in-1 (400 ml ~ 12 oz.) €3.98
4 rolls of toilet paper €1.62
Tube of toothpaste €2.30
Standard men's haircut in expat area of the city € 11

Entertainment

 
Basic dinner out for two in neighborhood pub € 25
2 tickets to the movies € 15
2 tickets to the theater (best available seats) € 37
Dinner out for two in Italian restaurant with wine and dessert € 48
1 cocktail drink in downtown club € 9
Capuccino in expat area of the city €3.79
1 beer in neighbourhood pub (500ml or 1pt.) €4.53
1 min. of prepaid mobile tariff (no discounts or plans) €0.49
1 month of gym membership in business district € 34
1 package of Marlboro cigarettes €4.12
   
Restaurants  
Meal, Inexpensive Restaurant  € 10.50
Meal for 2, Mid-range Restaurant, Three-course  € 40.00
Combo Meal at McDonalds or Similar  € 6.00
Domestic Beer (0.5 liter draught)  € 4.00
Imported Beer (0.33 liter bottle)  € 4.00
Cappuccino (regular)  € 1.30
Coke/Pepsi (0.33 liter bottle)  € 1.20
Water (0.33 liter bottle)  € 0.50