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The Laser Cannon was obtainable in Season 13: "Become a Supervillain" by reaching level 9.
Laser Cannon has already peaked in value, and while it still gets good offers, its not nearly as much as it was a few days ago. It usually only goes for 1-1.5M overpays, which is similar to other high demanded items (like Beignet or Pink LVL4), and is far less compared to what it could get beforehand. It's demand has also fallen off quite significantly, with most owners now trading their Laser Cannons away, as they've lost interest in keeping it due to it peaking in value.
Supply is widely distributed — no single holder owns enough to register as a hoarder.