I may be chiming in on this one a lil late but you could also try finding a commercial kitchen. I originally found one but I thought it was to far to drive so I searched and found one closer to where I live. I met with them. We signed confidentialty agreements anf I gave them my recipe. I give them $1,000 down payment (make payments on the rest), we then set a production date and I have to be there for it to test the sauce to be sure it is to my standards. They run a 1,000 bottle batch of the product, keep a couple of small bottles for testing. They test it for ph, nutritional values, and longevity (shelf life). Then I meet with the design people and develop a label. You see (at least here in Ohio) there is specific information that needs to be on the label and needs to be in certain areas. The put me in touch with some really great discount label printers (they deal with us small guys) We get the label delivered to the kitchen and as the batch is bottled (fully automated) the bottles are filled, sealled, washed and labeled. This is all done for me for the cost of $.271 an ounce or $2.17 a bottle (finished product).
I tried the idea of making it myself at home and the Federal Department of Agriculture and the FDA had a realllly BIG problem with that. They said that your facility must be FDA, DoA, EPA, and Health Department approved, inspected and have a Canning license. If you try to get around this and you do produce it on your own I was reassured there are big big fines and possible jail time.
I also have a few dry products (rubs and spices) that I have made. Again they must produced in a certified facility. Noe the kitchen I use for my sauces does not do dry products, they put me in touch with a local spicer that is certified and is quite reasonable on pricing. When you use a spicer you can get considerable price breaks on the spices due to the large quanities they deal in and you are buying unpackaged spices (bulk form) that do not have all the added packaging expense added into it.
Now I am still in the process of all the other legalities and insurance BS so I can't really comment on the expenses of that yet.