31.9 was the all time high. Almost every article/ newspiece related to bitcoin mentions it.
Actually:
June 10, 2011, 12:19 p.m. Obtain: 32.99 USD Gave: 1.00 BTC 32.99 USD 0.19794 USD Commission
Granted I can't prove it more than that or a SS from my TH account that someone will claim I photoshopped, but I did sell for $32.99.