Dubstepforum.com

Are there any?

There used to be one called ReasonFreaks back in the day but it seems like it's not been updated for a year or two. Anything else similar out there that's a specific Reason forum with possible Refills etc?

You could try these:
http://www.peff.com/reason/
http://reasonpatchaday.blogspot.co.uk/
https://www.propellerheads.se/forum/

And of course this:
http://dubstepforum.com/viewtopic.php?t=91073

reddit

honestly the official Reason forums were just full of fanboys before, but at least the talk was focused on the core product and getting the most out of it. now the only talk is about new Rack Extensions. maybe when all that calms down some decent topics will begin to crop back up.