Pretty sure the Grindhouse Referee book will not be in print. But the full art version is available for free at Drivethru:
https://www.drivethrurpg.com/product/14
se-Edition
That said, he did just reprint the original version of Death Frost Doom, despite having a couple of other reprints already available for that - but it was provided as a freebie for ordering 8 items from the store. It's always possible the grindhouse book could be reprinted in a similar manner.
The new Referee book will hopefully be available in the next release cycle or two (maybe within a year)?
Better Than Any Man will be getting an official reprint, likely in some sort of deluxe hardcover version.
I actually wouldn't be terribly surprised if the other free RPG day stuff was included as part of the Better Than Any Man reprint (like as a free rpg day anthology?), but that is definitely not officially announced, it's just my guess. Those other free RPG things may instead be released later down the road, or as a part of some other collection (or, possibly not all, but I would be surprised by that b/c they were all written by James Raggi, so he has the rights to re-release them however he wants.)
Noble Knight Games frequently has out of print stuff available if money is not an option.