Well i got a wicked deal cause I went with my school. From Germany I paid 240 euros for the following
4 day stay in a hotel in lesser prague (small part of the city)
3 Dinners
4 Breakfasts
2 lunches
2 tour guide (3 hours each)
bus ride there
Really quite good deal... I'd expect I could go there for about 400 euros for 4 days by myself... If you know where to go a good meal could cost as little as 2 euros. Thats with drink.