I had the same problem with Herpfood. However, if you call while their store is open (its in CA), they should answer. My hornworms came after about a month and I was told they had a supply shortage, which accounted for the delay.
Besides the delay, they were in great shape and are the cheapest place i have found. remember, they are shipped small and grow fast. Mine ran out of food before they reached full size, but the mulberry farms website indicates that this will happen.
FYI - Herpfood gets their hornworms from Mulberry Farms, but they charge $1.50 less and include the cost of shipping. THe delay is the only disadvantage that I see.
Hope it helps.