It’s not difficult saving tomato seeds, just takes a little time. The way I’ve done it is to squeeze tomato seeds and juice into a bowl or cup, and add about 1/2 as much water as tomato juice. Let it stand at room temperature for three days. (this can get a little smelly, so hiding them under the sink or somewhere is a good idea.) Stir twice a day, let rest a few minutes, then skim the scum off the top, and add a little more water. Seeds that float to the top are probably hollow and infertile, so skim them off too.

After three days pour the seeds into a strainer and rinse well. Dry thoroughly to prevent sprouting. Spread onto a plate, (paper plates work well, but you can use non-disposable too,) stir once a day to prevent clumping. Store them in a paper envelope when they are dry enough to snap in 1/2. Since they’re small, Drying tomato seeds usually only takes 2-3 days, depending on humidity.

It’s really easy to do this, just takes a few minutes or less each day for a few days. Growing your own is so satisfying, and growing them from your own saved seeds is, to me, worth the little bit of effort. From what I’ve read, each generation of saved seeds become even more well-adapted to a gardener’s particular growing environment.