I am a member of the Nebraska Food Co-op, so I listed them online, with a nice photo of each plant, or the actual tomato, (we still have some in the freezer from last year), and everything I listed, sold. They liked the fact that no chemicals were used, only crushed eggshells mixed in with the potting soil.
I repotted 3 plants to each 4" plastic pot, recycled from plants I bought half price, last year, and sold them for $2.50 each.
Last month's order cycle I sold 16 pots, and this month 19. Wow, that's 105 seedlings! No wonder, I ran out of 4" plastic pots, so I cut off large, clear plastic juice bottles, and poked holes in the bottom.
To deliver them, the co-op has a drop off point not far from where I live.
If you don't have a Farmers' Market co-op, you could sell them at local Farmers' Markets, or put a sign in your yard.
When they are fresh they add cool color to salads mixed with red tomatoes.