It does look good stuff, I've ordered some and will have it in stock in a few days, I don't think it's that expensive, the Deluxe CA has a retail of £7.99 for 20g, I don't know what that is in ounce's
From Wikipedia: "A US fluid ounce is 1⁄16of a US fluid pint and 1⁄128 of a US liquid gallon or approximately 29.57 ml, making it about 4% larger than the imperial fluid ounce."
Also the grams to ounce should be 28.4, but 28 seems near enough for practical purposes, for both US and imperial.