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Volvo’s small car lived for three generations before being quietly discontinued in 2011.
The best was surely the Ford Focus and Mazda3 related third generation which had an interesting selection of powertrains and avantgarde cabin design.
The line-up currently starts at $11,110 for the S40 T5 S and ranges through to $17,930 for the range-topping S40 T5 R-Design.
You have multiple options for replacing a Volvo s40 key fob, however without more information about your specific vehicle I'm not able to give you more information about the cheapest one. You can read more about cheap replacements for a lost or broken key fob here.
It sounds like a good choice and I've no bad news. Always check that the services have been done correctly and it's worth getting a full report from a motoring club before committing to a car.
The first thing is to make sure the system is bled properly and there is no air in it to cause a soft, sinking pedal. Your mechanic might well be correct, that it is a master cylinder problem, but I would be checking the brake booster.