The Nitron R1 rear shock is one option. http://www.nitron.co.uk click on Dealers and enter your zip code for the nearest one.
I've looked at the aftermarket shocks and they're all a lot more than I'm willing to spend at this point. I was hoping to find a shock off another bike that would match up and was rebuildable. My current shock is functional, just looking for something with the ability to change the fluid at the very least. Having to replace the shock just to get new fluid is stupid, from where I sit, but apparently, it's the same with FJRs, Honda STs, Triumph Sprints and HDs. Why???