I was still thinking about it before I went to take a nap. I then dreamt of a Filipino dancer who was in the same Music and Drama company as I was some 17 years ago. She told me her daughter had a starter grade Xiao Ruan and wanted to buy a better Xiao Ruan. So I sold her one that costs $650.
I conclude it is my subconsciousness telling me that there are loads of Filipino dancers out there with daughters wanting to upgrade there Xiao Ruans. I guess I better get my act together. (Disclaimer: I do not have any attraction to Filipino dancers.)
Currently I've only listed the Zhongruans, but there are 4 types of ruans, including the Zhongruan. In order of ascending pitch, 1) Da Ruan 2) Zhong Ruan 3) Xiao Ruan 4) Gao Yin Ruan. Here's a picture of them lined up together:

The ruans have a richer tone compared to the guitar, and it has only 4 strings. I've tried to play some blues and funk on the Zhongruan and it sounds alright actually. Not entirely trying to fit a square into a circle.
Will record some video/ sound clips soon.
Click here for our listings of Zhong Ruan.
Click here for additional information about the Ruan.