72-4.

Hundredths of sellers offered deep discounts during COMC's 2016 Black Friday Preview, Black Friday, and Cyber Monday promotions.

I stayed up past midnight when each of those promotions went live to maximize my success rate; but naturally, I missed out on a few deals during the rush, as detailed in the chart below:

Trading Card
Notes
2011-12 Panini Playoff Contenders Cup Contenders Patches Signatures 112 Drew Doughty (serial numbered */100)
The seller discounted this card in a promotion that didn't start at midnight. The person who purchased this card flipped it with a price of $22.99. The original price was $29.99.
2015-16 O-Pee-Chee Platinum Rainbow Purple 52 Jonathan Quick (serial numbered 4/25) I missed out on purchasing this card for about $8 because Quick was number three on my priority list.
2016 Panini National Convention VIP Wave Prizm 71 Ichiro Suzuki (serial numbered */10) A newly listed item that sold very fast for $10.
2016 Panini Spectra Immense Materials 19 Marcus Mariota (serial numbered */199) I missed out on purchasing this card for $3 because Mariota was lower on my priority list.

Overall, missing out on 4 deals isn't bad considering I had first dibs on 72 other deals...