I don't know of any manufacturers in your area but I have seen them up here in New England.
You can also buy a Manufactured home and all the log home manufacturers make log siding, so you can have it installed after the home is set.

Parker's Midwest Distributing is located in Paris, MO and are suppliers of vinyl log siding. This might be a more cost-effective alternative to natural wood logs, as natural wood needs to be maintained every few years with sealants.

Here is a link that might be useful: Parker's Midwest Distributing