No. Not any more. I used to carry them at a garden center where I worked. We grew short day length and cherry tomatoes for fall planting, making sure they were short season too. Because it is not common practice to grow fall tomatoes, most places just don't carry them. You can growing them yourself from seed, it's easy and you start now. Here is a nice list.

Moskovich
Oregon Spring
Stupice
Tiny Tim
currant tomtoes