I emailed the people at Nova Color in Los Angeles, and they sent me a hand painted color chart along with their catalog–
In the color chart in the image above, each spot of color is real paint. (I made the image a little dark to show those fluorescents.) Nova Color has made their acrylic paint since 1965. Buy from this manufacturer directly via their website for low prices. They also have gesso, varnishes, gels and mediums. Most of the Nova Color paints and mediums are available in pints, quarts, gallon and 5-gallon sizes at prices lower than what you will find at fine art retailer. I searched online today, and the lowest prize for a gallon of Liquitex matte medium that I found was $38.00. Nova Color matte medium gallon is $24.00. For significant savings, buy a 5-gallon bucket of Nova Color matte medium. I also noticed that the paintbrushes in the Nova Color catalog are priced lower than anywhere else. If you are in the Los Angeles area you can shop the Nova Color Factory Store for further discounts.
The acrylic fine art paint manufacturer, Liquitex, sent me a small spray can sample of their new acrylic spray paint. Their color chart is commercially printed and not real paint. Unfortunately, Liquitex only sells their paint products via retail vendors. But sign up on the Liquitex website to receive their newsletter and paint samples in the mail. I also received a new Liquitex paint marker, which I really like, but wish they made in larger sizes to hold a lot more paint.