Lightning Lane Question - Prebooking and day of

[mlggator22]

We will be hitting our first park on Monday - Epcot. We went to purchase and reserve our lightning lanes. We also wanted to purchase the lightning lane for Cosmic Rewind, but it said it was unavailable. I am concerned, because I am one of those people who were greatly affected by the DAS changes and I can't stand in lines for long periods. So I need to buy the lightning lane.
So my question is - will they release more lightning lane passes for Cosmic Rewind the day of? And if so, at what time?
Hopefully we are not out of luck.