If yes, I have (another!) alternate solution for you!
There are little farmer's markets all over this great city, they just don't look like those you see in the states.
The pictures below are from the market I frequent.
From talking to the vendors I believe this market to be pesticide free. A couple of them have even said it is organic, if I an understanding them correctly.
The potatoes are super fresh and straight from the ground -- you will have to scrub them to get the dirt off!
A couple of my plums have had worms in them, so I'm pretty certain no pesticides were used on them!
If dirt and worms freak you out, then this is not the market for you, but if you are like me and are happy to see a worm here and there and then follow the directions at the bottom and check this place out!
Walk out the gate at Ichon
Turn right and walk....pass Park Tower Apartments on your right
Right after Park Towers you will see the vendors hanging out on the street every day EXCEPT SUNDAY from 6-9AM!
Prices are great and quality is good!