If you are near a Trader Joe's (and they are now across the country), they have a number of ginger items, including a triple ginger cookie with lots of real ginger in it...wow, are they good! Also real ginger ale. I would imagine most "natural foods" grocery stores and health food stores would carry ginger capsules and foods with real ginger.
Interesting about it not being recommended for m/s; I know quite a few people who have sworn by it, including some who live on Catalina Island and have had to cross regularly while suffering m/s. I guess like any other substance it has the potential not to be benign, and users (especially pg ones) should do their research before making a decision.