What's a Mellon Worth?

Depends if it's square or seedless.

We found this little beauty for 15,000 yen ($150) in Shinjuku. 

 Maybe a square mellon is novel enough to shell out that kind of money for,

  but these 31,000 yen ($310) cantaloupe must be perfect

 in a way I'll never bring myself to know.

Couldn't be positive, but babel fish Sandra tells me the difference between seeds or seedless will cost you  about 50 bucks.  These were in the basement of my office building. OISHI!