Thanks to Prime Day, the Bose QuietComfort 25 Wired headphones for Apple devices are available for $125, down from its original $299 price tag. Many took to social media to complain that they couldn't order items.
Amazon did not immediately respond to requests for comment.
Some movies and TV shows will also have massive savings for Prime members, at 50% off. Amazon is even giving away a free PC game each day until July 18.
The Amazon Prime Day sale lasts until tomorrow, and more deals will be coming over the next few hours.
Amazon Prime Day has grown rapidly in recent years and now brings in billions in sales for the company.
Ebay is offering deals up to 60 percent off electronics.
Prime Day also usually helps boost the number of Prime memberships.
"The outage is especially problematic as many of Amazon's Prime deals are promoted for a set window of time - something that could cause a great deal of frustration for potential customers", GlobalData Retail Managing Director Neil Saunders told CNBC. It's hoping to keep Prime attractive for current and would-be subscribers after raising the USA annual membership fee by 20 percent to $119 and to $12.99 for the month-to-month option.
A screenshot of an Amazon error page taken after the start of Prime Day. Among them, a Fingerlings unicorn doll whose horn lights up and a Delta kitchen faucet that can be turned on through Amazon's Alexa voice assistant.
But Amazon officials said the sale benefits brands large and small.
BACK TO SCHOOL: The company is making a big push in school supplies.
This sort of a glitch won't boost satisfaction levels for Prime Members, who tend to shop Amazon more frequently than non-members (75% make purchases two or three times a month, according to RBC's survey) and are more loyal customers.
Hallelujah! Amazon Prime Day 2018 is finally here, and prices are being smashed all over the place.