The prices of most fruits and vegetables and even plants are getting out of control.
On the bright side, for many things once you have planted you can collect the seeds for future use and not have to buy those plants again.
You just have to know when to collect the seeds, how to collect them and how to store them. All of which you can find on the internet for free thank goodness. I love free information!
As a matter of fact I found a great website for beginners and thats just one of thousands of sites.
Check it out or just google the information you are looking for.
Collecting seeds