Amazon is turning its already traditional, 2015-launched Prime Day annual sale into a 48-hour thing for the first time this year, but bargain hunters may find it pretty difficult to keep up with the avalanche of deals coming in a few weeks from the e-commerce giant and two of its biggest rivals.

Hot on Target's heels, eBay has just announced its own Prime Day challenger, and amusingly enough, its success hinges on Amazon's ability to keep its website up and running throughout the two-day deal marathon. That's right, the aptly named eBay Crash Sale will include a special batch ...