GA tickets have been very hard to come by - I suspect they have undersold the floor so far until the exact dimensions of the stage are known, at which point GA should be back on sale. Same sort of thing happened with Lady Gaga last year, couldn't get GA for the first couple of nights for love or money when they went on sale, couple of months later once the stage layout was known they were easily available. So don't give up and just keep an eye on AXS.
Thank you for taking the time to reply cdparky. I'll keep a check on AXS as you suggest. I hope you got lucky, and if so, enjoy the show.