On May 3rd, between 11:15 and 11:20, there were 38 trades on MtGox at 79$ / BTC. A total of over $34,000 was traded at this price.
I used the following in BigQuery to find this out:
select * from [mt-gox:mtgox.trades] where Currency__='USD' and Price <= 7900000 and Money_Trade__ > 1367366400000000