Hi Joe,
There are a couple of local manufacturers in Omaha that may be well worth calling or visiting. They are listed in post #2 here.
The odds are good they will have something suitable that is in your price range. If it would help you, I am always looking for an “excuse” to talk with local manufacturers that I haven’t had the chance to talk with yet and I’d be happy to talk with them and pass on my impressions.
Failing that, you could also use local mattress outlets to zero in on the mattress construction that works best for you and then use this information to order from an online manufacturer (several of our members ship across the country). There is lots of information on this site about how to do that and I’d be happy to help here as well if you need it.
Phoenix