Ah ha Jenny i am the queen of finding bargain hols
Yes all those prices include flights. They are through diffrent websites as the prices vary from one to another so much. I also look at separate flights and accom if that makes sense.
Places ive looked are holiday city superstore thats where the Corfu ones are from. Thomson for croatia. Easyjet, XL and flightline also On the beach and Alpharooms. With most you dont get a rep and some you have to pay more or organise your own transfer which we may not need as will more than likely hire a car. Its also worth playing around with the dates a bit if you can and the airport you fly from can make a diffrence.
Where and when do you want to go? What board, facilites etc do you need. Where can you fly from?? I can look for you if you want.