what does it cost to re-chrome pieces of my bike that have aged a bit.  I can do most of the prep work, but is it worth having a piece rechromed or buying the part brand new?

In my case the biggest part i need redone or replaced is the exhaust pipe from the cylinder to the muffler.  Mine is brown with rust on the entire backside and i got anew muffler recently.  I want to replace or fix the pipe while i have the new muffler to put on as well.
thanks

where can i buy one and what am i looking at spending?