I've been looking around my area for Red Line transmission oil, but no luck so far. Is there a good place to buy it online?

www.myoilshop.com

use the search and you will find the 10% off code. Should be about $31 shipped after discount (4 qts).

Look around for old school speed shops, also harley davidson guys use the same stuff.

I usualy just pick some up from Brian @ courtsey when I buy replacement parts. Good guy, good prices.