One 2 oz. Sample Jar is enough to paint approximately 4 square feet. Most of our sample jars are in the flat finish. $4.00 each plus Priority Mail shipping and handling. Gallons are available in flat, eggshell & semi-gloss finishes. Darker colors, reds and oranges don't cover as well, so you may consider getting more than one jar or a pint. Also, please note that our sample jars are not meant for touching up previous paint projects. For more on touching up visit our Painting Tips & Touching Up page.