Cut tomato suckers, bury them in garden soil with added vermiculite (which absorbs 10x its weight in water), cover with a clear juice jug with bottom cut out and no lid. Keep it watered and it will root. New plant! Now that's thrifty.
I got 45 new tomato plants from FOUR original plants, by plucking off the suckers and just sticking them in soil - only a few suckers didn't root. This extends your tomato-growing season and saves a lot of $$ because you're not buying more plants!
