if you don't want all kinds of advice and answers then don't bother with forums, it's a place where people speak their minds, so expect anything.
the last reply was right though, 240 seems close to what it would normally cost. when you take your car to a place that tells you they can do a "full detail" for close to a hundred. you are basically getting a tunnel wash, some guy drying the car halfway before another goes full speed with a rotary. and then they cover up all of the holograms with a glaze/wax, give it a month and your car will probably look worse than before.
although here is the real question here. what are you doing about your driveway and current conditions of the car? if you plan to keep leaving it in the sprinklers and collecting water spots every morning, you should just save your money, because improper maintenance will destroy the best detail in just one wash.
if you do end up wanting to pay good money for a good detail, ie, enough correction (probably 2 or 3 step) to get rid of those water spots, and then add a very durable and long lasting sealant or coating. you are going to need to pony up a little over 300 or so if you find the right person. and then you'll also need to tackle the task of finding out what to do about the reason why your car go the water spots in the first place. it's just throwing money away the same as having someone do a full detail of your cars interior, and then taking a kids soccer team to the local dairy queen for chocolate ice cream cones in the summer heat with no AC.... improper maintenance spells disaster.