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I`m not sure if these are available anywhere other than Houston, but I found them in the deli section of my local grocery store. They are fairly large po-boy sandwiches and are so delicious! They are delivered daily so are super fresh. They have ham, provolone, salami, mayo, pickles and chow chow, which is some sort of relish. They are expensive at around $4 each but they are pretty big and could feed 2!
Image is mine