If you visit Challenger website now, you should be able to see a banner with the word Surface and a partial picture of the Microsoft Surface. Click on it, you will be able to see a series of Microsoft Surface RT features and accessories.
So, be sure to check out Challenger for the sales of Microsoft Surface RT. If they are launched this month, it is actually on par with the official news of several countries including Singapore to get the Surface RT from late March 2013.
On the Challenger.sg site, there is no mention of pricing of the tablet or its accessories.