Buy one get one today only. It has not been posted on the March Mayhem page (another Pogo error) but someone was messing with the code MAYHEM and found this:
Premium badges - buy 1, get 1 free (Excludes Mix-n-Match bundles, Limited Edition badges, and Quick Fixes Premium Badge Album)
I just did it on 10 MnMs and paid for 5. Whoopie I am all caught up. The wording makes me wonder if you buy 2 (other than Quick Fix) Albums if you get BOGO too.