$25 watermelons in Korea

I read something today about weather being blamed for produce prices going up this year in Korea. And it's true that things have been a bit different weather-wise this year but prices for things like watermelons are ridiculous right now. A few months ago a co-worker of mine couldn't believe they were up to $16, how cheap that seems now. It could be a seasonal thing, but $25 or £16 for the ones I saw in Homeplus today is a bit steep. A few days ago I saw them up to 31,000won too, for that price I'd want one of those square watermelons you get in Japan. How expensive can these get?