I think US people still prefers buying stuff from big outlets such as,
1. Walmart
2. Target
3. Best buy
4. Costco
6. Apple
I heard these stores run very lucrative deals. And also provide 30 day trail(not sure if it's available now) used to hear Indians changes TVs for every 30 days without spending a penny 😂.
amazon ecommerce competitors might be ebay.
but unfortunately Amazon is leader for e-commerce in US.