What disability? Gullian-Barre syndrome?
Rochelle Farms up Texarkana way usually trades some in dairy cows, they might would have something for you and you'd cut some driving. I know there's some big dairies up north of you. It goes against my grain to recommend what I'm about to say next but since a lot of homesteaders aren't "cattle people" you usually can scoop up a dairy cow off of Craigslist because most of them don't know where else to sell one.
So, this is the good, the bad, and the ugly of it: unless you're doing bottle calves or have a market for it pre-set, any large dairy cow will out-produce your needs. This isn't 1907 anymore and most people don't have six kids, two parents, and a grandparent all in the same house. Yields will outpace demand even if you make butter or cheese unless you basically just go shares with a calf or calves through its entire weaning cycle and for a small household even that can be too much (on some milkers you can go shares with two calves and still cut out a gallon a day for yourself). Now, if you've got hogs or a garden this is no big deal, anything you can't sell or use can be recycled without waste. This is the only real argument for Dexter cattle, they make good family milkers. It's also a poor argument, because a good Devon will outpace that Dexter in most metrics and leave you a steer to butcher that you'll love.
