PPG Base/clear paints online??

What's up with PPG prices. Gallon Hemi Orange almost $500.00 bucks? Last tine I bought this it was half that price. Now I see that TCP global has their own line of paint. I called and they told me it was because of PPG pricing and that their paint and clear is as good if not better than the PPG?? Anybody here deal with this stuff lately? I know the EPA sometimes has a lot to do with this and it even gets fine tuned from state to state. I want to b uy a real good quality Hemi Orange Poly paint in the base/clear system. Do I have to go for the PPG, or are these other brands as good? I let a body shop shoot a clear on a car years ago, and it yellowed in a year. PPG has always stayed crisp. Any body guys out there. I know the PPG Hemi Orange Poly I last used has a very fine metallic in it that really shines in the sun. That is what I am looking for. Help???