Boosted by a record $2 million 'Super Mario Bros.' sale, the retro video game collector's market is being overrun by speculators looking to cash in
On July 12, a copy of the Nintendo 64 classic "Super Mario 64" sold at auction for a whopping $1.56 million, instantly making it the most expensive video game on the planet.
Less than a month later, it was bested by a previous entry in the same series: a sealed copy of "Super Mario Bros." for the original Nintendo Entertainment System that sold for $2 million.