I just save the used kombu and bonito flakes when I make dashi. I strain it out of the dashi and then bake the kombu and bonito in the oven. The dogs LOVE it! The kombu is dirt cheap, about $1 per bag. The bonito is more pricey about $10-15/bag but you don't need much and one bag lasts me about a year.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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