I really don't reccomend buying paint online. Most sites do not promise that the paint will reach you un-broken. Even then the shipping is alot because of how much it weighs. You're really not saving ANY money buying paint online. The good thing about buying at stores is that you can inspect it for dimples or broken paint before you buy it, unlike online stores.
Haha, I was lucky enough to catch a sale at my local sports store... case of 1200 for $20. Decent paint, not super-great, but oh well. I have a 98 custom, so no need for really expensive paint.
cant post any sites other than xpaintball, but they have good prices. But unless your field sells paint for over 60 bucks a case, its not really worth it