I actually had this exact same idea in like...2011. So, ideas are worthless without execution. I used to work in Middle Georgia where Vidalia Onions are plentiful. I went to visit a friend in NYC, where Vidalia Onions are scarce. I brought some with me on the plane...

The plan was I'd just run to the local grocery store and just fulfill online orders and if demand was there, purchase from local farmers. I didn't get any further than than just mentioning the business idea. Kudos to Peter for executing and meeting a need. Looks like he also owns onions.com, so they are making enough money to acquire that domain name.