Whom do I talk to have a tarp placed on my roof and what is the estimated price?
Any roofer. As for price, a king’s ransom!
You need to have an experienced roofer install a tarp. Only tarp it if it is absoultly necessary and the issue cannot easily be temporarily repaired any other way. Half the tarp jobs I see do absoultly nothing as far as keeping water out and just flap around until they blow off. The tarp needs to cover from the top of the roof down past where the defect is.
And it needs to be installed in such a way as to not blow off because it is essentially a big sail.