I saw a lot of them at a nursery in Illinois.

We have several Amish growers here with good supplies, Sure hope you are able to find what you need

First of all, all peppers hot or sweet are basically "Green" pepper plants, they start out dark green to green to chartrese yellow green to dull yellowish like a banana, then ripen to another color. "Green" bells, as well as "Red" bells, and "Yellow" bells are extremely common, of course they all start out as green peppers so they are all green peppers. The "Green" peppers they sell usually turn into red peppers. The "Red" peppers start out green.

Yes, stores are trying to make higher sales by selling single peppers for 2.99 to 3.99. Not sure why you think the small ones are stunted. The bigger ones may be stunted too. Look around. Once in the ground the plants usually take off if it is no too cold.