There are some stalls selling interesting local desserts near the traditional costume area of the cultural village at Suwon. These desserts are clean, tasty and cheap, and is a good experience to try.
My FAVORITE souvenier from Korea came from Suwon. In the Korean folk village, you can watch a craftsman who makes parchment, then carefully paints on the kanji characters. These parchments are also for sale. I bought one for $5 US that is about .3m wide and 1 m long. It translates to "May you live long like the mountain, and be blessed like the sea." It rolled up small enough to fit in my luggage, and I had it framed at home. Beautiful!
The man didn't really advertise that the parchements were for sale, my friend just happened to ask. Awesome!!
What to pay: about $5 US.