What are my rear shock options ?

[Freza]

So...my rear shock is done.
I did kebab's front forks modification (emulators) and now the front end is like new, but it highlighted the problem I've been suspecting - the rear shock needs to be changed.
All I'm finding on the internet is the YSS Z-series monoshock: http://www.wemoto.com/bikes/yamaha/fzs_6...monoshock/ which is not particularly cheap (can be found on ebay for less).


Are there any other worthy options to consider ?


Thanks