Reno Paint sells top quality paint for just about anything that you might need it for. Not only that but the staff knows their stuff...I got sick of going to Home Depot and getting blank stares when I asked for a good white paint that would cover well, but Reno Paint directed me to the correct paint in a matter of seconds.
It seems that all the pro's in town go to Reno Paint so you might have a bit of a wait in line but it's well worth it. And, while I have no proof of it, a few painters have told me that the big box stores - Lowe's and Home Depot frequently sell a cheaper version (i.e. not as good) of the same brand paints that Reno Paint sells.
Hint: It's also a great place to get referrals to good local painters if do it yourself is not your thing.