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I'd ask an AC recharge firm to check the pressure of the gas / coolant in the system as if its low then this can produce intermittant operation
alternatively you can buy some AC refill bottles from Walmart with a small pressure gauge on them so you can measure it and top it up yourself
if this level is OK then I'd suspect the pressure switch is faulty and to replace it you will need to have the system drained professionally
typically a new pressure switch is about $40 and then there's the cost of fresh gas on top which is about another $100 plus the labour charge to replace the parts
so all in I'd expect about $250 - depending on the garage you use
do you still need help?
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