I'm going to Greece for a 12-19th August with the family for a week.
My oldest son aged 20 gets his second jab on 3rd August, so he just about wont have to quarantine on return, but will have to take a lateral flow test to enter Greece (as it will not be 14 days since second vaccination). My younger son aged 17 will also need a lateral flow test to enter Greece, but is young enough not to quarantine on return. Myself and wife both doubled vaccinated for a while now.
So my research tells me we'll need to arrange 2 x lateral flows to enter Greece (£34 each), 4 x lateral flow to leave Greece (20 Euro or £17 each) and 4 x day 2 PCR tests (£43 each). So by my reckoning Covid testing will add £308 to the bill. Prefer not to pay it, but worth it to get away.