As promised by The Cure and the promoters, more tickets are starting to pop up.
Check RAH 29th, Gigs and Tours, and See tickets daily.
Update (03/27/14): Standing, Stalls, Circle tix for the 28th available right now. And Standing & Circle for the 29th. Same available at See Tickets right now.
Also, Grand & 2nd Tier and Stalls for the 28th here.