Prices for Stock Parts

Just wondering if anyone has ever bought these parts new from the dealer… I still after 4 nights of playing around, cannot figure out what is wrong so looks like im going to have to replace things

I need to know what i can expect to pay for

MAF sensor
Coolant temp sensor (for the ECU)
Fuel Pressure Regulator
IAC valve

thanks

oh and could anyone think of a reason why the car would have trouble starting when its been sitting between 30 and 90 minutes only??

Thx