I really don't know about pricing for chrome plating. But, check out a motorcycle shop or custom car shop. You know, the places that do 'custom' work.
Motorcycle shops are good because they do a lot of custom chroming and custom powdercoat paint jobs.
Powdercoating your bike is the ONLY way it should be painted! Powdercoating makes regular paint seem like grease splashed on the frame for how quick spray paint comes off.
Anyway, motorcycle shops can really hook you up, if you go in and explain your situation and what you want to do. Just talk to them and see if you can drop off a part (completely ready for chroming OR painting!) and have them send it out with their next order.