Rather search for a local supplier to keep your shipping costs low.Visit local stores or food businesses that would use a product like this and find out about their suppliers.
who on earth would want that? - people want fresh cakes - by the time you buy them, get them shipped to you,and then sold - they could be days or weeks old and you will have to buy a huge freezer and pay the utilities to keep them frozen - I have never heard of anyone being interested in wanting frozen sheet cakesthey would have to be shipped overnight to you in special refrigerated trucks or packaging that will cost a fortune - no one is going to pay you $50 for a frozen sheet cake