Actually Neon only produces red colors so most 'Neon' lights are actually coated with phosphor and filled with Argon.
You need to contact a local Neon repair shop to get a price, probably need to take it to them or at least provide a picture and dimensions
You can learn how Neon signs are made here
http://videos.howstuffworks.com/discovery/27710-how-do-they-do-it-creating-neon-signs-video.htm?sort=date&page=2
.
Actually Neon only produces red colors so most 'Neon' lights are actually coated with phosphor and filled with Argon.
You need to contact a local Neon repair shop to get a price, probably need to take it to them or at least provide a picture and dimensions
You can learn how Neon signs are made here
http://videos.howstuffworks.com/discovery/27710-how-do-they-do-it-creating-neon-signs-video.htm?sort=date&page=2
.