Hair is officially one per person but depending on the day, they are willing to skirt that a bit.
BUT... also depends who you get. Officially not on sale until sold out, but partial views don't count in that. Unless its the lady selling tickets. Then she will not budge. (I know cause Ive tried several times in the morning at 10 am and only when I returned later in the day, there were still partial views left but the guys said they always go on sale at 10am and they were sold out of SRO already. SOB!) (I eventually got SRO but again, woman said no, man later in the day said they started selling at beg. of day and sold me one of the last ones (and yes, there were still a few (very few though) partial views left)).
So basically? annoying cause its so inconsistent.
http://tapeworthy.blogspot.com