What is the fitted price?
The number that matters. Fitting, balancing, new valves and disposal of the old tyres are usually charged on top of the tyre itself, so ask for the total on the road rather than the price per tyre.
Do I need to replace all four?
Not always, but tyres should be replaced in pairs across an axle, and all-wheel drive vehicles often need all four to avoid drivetrain wear. Say what you drive and you will get a straight answer.
Can a puncture be repaired?
Often, if it is in the tread and not the sidewall. A repair is a fraction of a new tyre, so it is worth asking rather than assuming a replacement.
How do I know what size I need?
It is on the sidewall of your current tyres, in a format like 205/55R16. Put that or your registration in the request and the quotes come back for the right tyre.