You and mrs slick will be getting different online prices for the following reasons that I been told in past ,,,,,,,, the computer is programmed to change prices on the age old model of supply and demand
Therefore to exaggerate for example if your a booking of 10 people and you ask each and every friend to view that same holiday,,the programme assumes that each of them 10 people want 10 of them slots and re evaluates the price accordingly Especially when tickets are only sporadically released at any given price ,,,
it has also been advised in past with holidays especially,, to try and book them on a Tuesday evening if possible as there is little online traffic,,, and avoid it on a Sunday evening when everyone is doing the same,,, if you look at hotels on booking com it actually tells you how many are after the rooms,,,so the computer does in fact know a lot more than the credit we may be giving it
I would personally prefer the agents shop as there on commission and much more likely to give a deal or free upgrade ,,,,,,as ever with things like this ,,,please get some free protection and pay by credit card