Because Walmart likes to release its most jaw-dropping TV deals as a handful of pre-meditated doorbusters, more shoppers will be waiting in the wings for the clock to strike a certain time (rather than calmly perusing several pages of TV deals) — which means TVs selling out is more likely and time is of the essence.

The best Walmart Cyber Monday deals are up to 82 percent off. Find tech, toys, fashion, kitchenware, and more at major markdowns from top brands like Apple, Sonos, Lego, and more

Amazon's Cyber Monday has begun. Here's what to know about shopping the sale, including how long deals will last.