The registry for the cctld (Seychelles) .sc has lifted restrictions for registrations and the domain extention is now available for anyone to register.
After some domain searching, yours truly is pleased to say that there are still many great keyword specific .sc domain names to be registered if you're looking for a Search Engine Rank booster.
The lowest price I found to register one came at a price tag of $49.95, but with great domains (as of this writing) like videogame.sc and weblog.sc etc still available, this extention is definately worth a look into. Especially considering .com, net, org and most of the other alternative tld keyword domain names are virtually non existant.
If you're wondering if the dot sc extention is viable, check Whois-Source as an example of a site that's been using the .sc URL as its web address of choice for quite some time now with great success.
For more info on the .sc domain or where you can register one click here.