Where do i get crop/vegetables/fruits yearly price

Iam new to farming and about to start my own farm,but before i do that i just wanted to know from where can i get yearly price of vegetables or fruits.The reason iam asking is that i want to study the price and probably go for the commodity which is has the most stable price throughout,since iam new.
So can any one advise me on how to get this info or how you guys decide on what to grow or how you guys study the market pricing.
Please advise
Thanks in advance