How much does it cost to replace a radiator.

It depends on what the shop charges for labor. C1500---5.7L engine, labor time is around 1 1/2 hours. That doesnt include replacing radiator hoses and coolant, that would be extra, labor and parts.

I looked at rockauto. Com for radiator price, about 125 dollars. I dont know what they charge for shipping? The cheapest parts are usually not the best. When it comes to money, that is your decision. The shop probably isnt going to like you buying a radiator and bring to them to put in, I dont know? If you install the radiator yourself, you have no labor charge.