I purchased this wasabi powder at our local Shaw's (same as Albertson's) for $2.99.  It is a very practical way to buy wasabi because you can make your own wasabi for sushi simply by adding water and stirring it together in a small bowl or you can add this to mayonnaise, mustard, oil and vinegar or do whatever you please with it.  This powdered wasabi has fresh flavor and it's an easy way to keep wasabi on hand for getting creative.  How about adding a small amount to a rub for seafood or steak?