My two favorite go-to seed shops are Totally Tomatoes
https://www.totallytomato.com
And Kitazawa Seeds
http://www.kitazawaseed.com
Mr. Kitazawa started in business after a stint at my grandfather's nursery in Oakland CA. That was back in the 1920's.
But if your plants never get taller than 2 inches, there is still a problem. Are you choosing to grow veggies with too long a growing season for your area? Do they bolt at 2 inches?