Tomato plants grow great from cuttings. In one week sitting in jars of water I get lots of roots started. One more week potted up in damp soil and presto, they are ready to go into my garden.
I start some from seed, buy a few (for variety) and anything I pinch off early enough in the season I'll root as cuttings. I easily plant around 20 tomato plants and we still never have enough for making fresh pico de gallo! I should probably take end of season cuttings for winter tomatoes but I haven't tried that yet. I think I will this next winter.