There is no fixed answer because it depends on how much work the gunsmith will have to put into the job and how much he charges. The gun will have to be disassembled and prepared for blueing. You should contact a gunsmith in your area and have the job estimated. Hint: for a JC Higgins gun, the cost is probably not justified for the value of the gun.
Send it back to the factory or a trained professional
Would have to see how much damage was done with the reblue. If this was a restoration, instead of a reblue, the gun could still bring over $1000. If it is a typically wheel-buffed hot-salt blue - which is totally inappropriate for that gun - value is maybe $400.
depends on which gun.
Cost will change depending on how much work is done, or how much of the gun is painted. Typical cost of a simple 2 color fade over a full gun is around $250-300
It cost 10,800,000
$200 for a BB gun
We need to know which gun. Prices vary.
You will have to describe it in more detail.
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$20
It is $35.54!
Depends on the gun. Anywhere from $20 to $200,000. Sort of like how much is a car- depends on the car.