Where to Sell (and buy) used unicycle on the internet

For unicyclist living in Singapore,
your best chance is to post your ads at the
Singapore unicyclist community forum at
https://groups.google.com/forum/?hl=en#!forum/singaporeunicyclists

You can also post a free ads at http://singapore.gumtree.sg

You may consider selling your used unicycle at "Cash Converter" stores. There is one near Bedok MRT / bus interchange.  There is another one near Jurong East MRT / bus interchange.

Other avenue ...

Look for the "Trading Post" thread at:
http://www.unicyclist.com/forums/

and ebay website.

For beginners who bought expensive beginner's unicycle, I wish you good luck.