Came across this one while searching for keycaps:
http://forums.vr-zone.com/other-hardware-components/3395607-leopold-fc660m-pbt-dark-grey-keycaps.html
(no affiliation with the seller)
How is this remotely a good find? $140, even with an extra cap set, is way too high of a price for one of these.
Did you take into account it are Singapore dollars and that it comes with an extra set of keycaps and that it has been hardly used (basically it is new)? That is about 100 USD..... It would suit someone not living in the US since shipping from the US is prohibitive....
$100 USD is a high but not horrible price if you really wanted one of these fast. But, if it's in singapore and a peer to peer sale it's kind of useless to everyone outside singapore.
I paid $90 including shipping for one with MX clears almost two years ago, keyboards are a good bit cheaper/easier to find nowadays. The FC660's are still about $90 but many other options in the same/similar layout are available which used to not be the case.
Considering that I mentioned "even with an extra cap set" I do believe I accounted for the keycaps. An extra keycap set is rather meaningless if you don't have another keyboard to put it on. From the picture it also looks like the caps are only for the letter keys, while the real important keys in a FC660 cap set are the modifiers and spacebar.
If you want to advertise your stuff for sale, try the classifieds subforum.