Check the other threads re APs and April discounts, as there are a couple of folks who managed AP rate rooms at the GF and the BC. I got $324 for the GF GV for the end of April. I think someone posted a discounted rate at the BC of $259. But I don't recall the timeframe.
It is certainly possible that all of the AP rooms for the GF and BC are gone for now. However, with the flurry of cancellations and changes, ava can change from day to day. Keep trying. . .