This is something that anyone can do, even if you start with only one plant! I don't really have the greenest thumb (and I don't even think I have a "greenish" thumb, considering the past 3 years I have had to buy a new basil plant at the beginning of each summer). Even though I spent $3 on a new basil plant each year for the past few years, I still saved a ton of money not buying basil leaves from the grocery store.
If you don't have access to a large area to garden, you can ask your friends/neighbors/co-workers what they grow, and you could pick something different and then exchange herbs/veggies with them. When you grow your own herbs and vegetables, it's easy to have an overabundance when they start to grow!