I just read two posts on 2 other sites that Testor's Mystic Emerald (Lacquer paint) is a pretty close color to Campus Green; the only problem there is that it comes in 3oz aerosol cans. So a whole bike will probably need several cans. Still at least 50% less expensive than Koolest Kolors though. Another guy says that there's a very close powder coat color called Illusion Money from PrismaticPowders. So maybe there are other options after all. Not genuine Schwinn colors, unfortunately, but hard for a non-expert to tell the difference without a side-by-side comparison.You picked all the really tough colors! Someone told me that Ford has a yellow that is very close to cool lemon. If you can figure out what model and year, you can order duplo touch up spray cans. Sierra brown may be able to be color matched at an automotive paint store. Mine will sell custom matches in a can for about 25$.
Thanks for the tip on Kool Lemon.