Most processed food is marked kosher. Check next time you shop. There are some exceptions for meat products, but, for example, I am pretty sure that you will not find a can of tuna that is not marked kosher. From the link you shared: >When you add kosher certification to your products, chances are your consumers will not pay a penny more. Just as you would not find it necessary to pass on the cost of commissioning a third party chemical food analysis, basic insurance, or other similar service to your customer, kosher certification cost does not generally affect pricing decisions. In fact, mass producers often find that kosher actually lowers the cost per unit by increasing sales. And many Seal-K companies who add kosher certification report that they find it easier to place their product with new retailers and thus reach more market share. (Due to the very high level of supervision expected, and valued, by the consumer, meat products are the obvious exception.)