Two things:
To add to ricib's grocery store freezer selection; check out Trader Joe's if you have one nearby. It's a really nifty store, and has more cool stuff in the freezer than anyone.
By the way, Faith Popcorn, a think tank type trend predictor/ advisor, predicted the Trader Joe's type of friendlier, more personalized concept back around 1991. There are others, varied in nature and scope; Sunflower Market in the west (the Olive Bar alone is worth the trip, not to mention THE best bulk section ever).
Marketing your classes, I bet that emphasizing that you teach safety, health and sanitation throughout would be just another "hook" to attract clients.
Also, you've probably already thought of this, but lots of folks are starving for hors d'oeuvres ideas.
Best of luck to you.
Mike
www.lasvegascatering.com