the cheapest way to get to see Hair would be SRO Or lotto My advice if you don't mind standing buy SRO when the box office opens and then try lotto if u win sell the SRO Or buy the $37 mezz seats and lotto and if u win sell the mezz seats Or if u don't want to lotto just buy the $37 mezz seats (I've heard they are very good)
Also they sell Partial view for $82 and I think their is a Broadwaybox discount for $85 Enjoy its an amazing show
I sat in the $77 mezzanine seats (which the box office sold after lotto for $40) for part of act 1 (a bunch of $120 seats were empty, so Bryce and Gavin came up and told us to move down), and I was in the row in front of the $37 seats and they were great.