You might want to look here:

http://www.specialtybottle.com/

Within the Glass Bottle category they list Amber as well as Clear and Blue.

Personally I choose glass over plastic because I believe the plastic will pass air. There is no known reason not to use glass and a lot of hearsay or rumor or myth in using plastic.

If you're not buying hundreds of bottles then a dozen glass won't cost a significant amount over plastic. You'll have peace of mind. That's valuable.