I was shopping at a Home Depot in Dallas the week of January 16th, and they already had fruit trees available for planting. They had apples, peaches, and plums. Most were in 5 gallon pots. However, they also had several nice sized trees in what appeared to be 10 gallon pots.
Unfortunately, they did not have the rootstock listed for any of the trees, so you have to take a leap of faith in terms of how big they may grow to. You also have to assume that they were properly labeled as to the variety.
I'll try to canvas some of the other nurseries in town and see what they will be carrying this year.