If you're stuck with using your local airport the prices can be horrendous, ours is Newcastle and while the prices are not too bad the flights (irrespective of which tour operator you booked with) are all provided by Monarch who I wouldn't recommend to anyone over 5' 4" tall!, and the other problem is of course availability, if you don't live near London or Manchester most charter flights only run from March/April to October.
We've flown from Gatwick, Newcastle, Manchester, East Midlands and even Dublin and Amsterdam to get the best prices, for the dates we wanted, usually flying scheduled with at least double the charter flights luggage allowance for all the shopping!. So far the best has been £99 each and the worst £305 but that was First Choice Star Class Premiere so still a good price
I usually get flights for £250 - £300, car hire from £80pw for a 4 door economy with full insurance and a 3 bed condo or villa anywhere between £175-£230pw. If you've got a good deal locally then that's great
While DIY isn't everyones cup of tea the flexibility of number of days and cost savings make it my first choice, if I find a cheaper alternative I'll certainly take it!