You can use this site to book as well, and if you mess around with it a little, you can see what dates are still available. (Specifically, after you enter your dates and other info and search for availability, then uncheck the "available room only" box. It will then show you which of your dates are available and which aren't.)
The discounted rate is still available for the nights of April 15-21 for GCH ($429/night) and the nights of April 15-22 for the DLH ($329/night).
Thank you!!
That week is Easter Week, so I'm worried about crowds for Spring Break (not college Spring Break, but kids off school that week). In Disneyworld that's a big deal, is it the same for DL?