Half value = red flag.
But there are ways to earn 5 dollar amazon cards for free via the bing search engine.
I suspect someone has 1000 emails and with scrypt coding could earn 1000 x 5 = 5000 in cards a month.
I earn 1 every 22-28 days as does my wife.
How does it work and what do you need to do? Are you receiving points just for using bing and google?
Only bing offer such deal, but i'm pretty sure bing collect user's personal data & use it for various reason (sell it to advertiser, personalized ads, etc.).
It's sweet deal if you absolutely don't care about your privacy.
I would never purchase a gift card from a seller advertising that he has a huge amount or that he can get any amount anytime. Those are hardly legit.
IMO those aren't accurate in these case :
1. Popular seller such as Bitrefill
2. Have normal rates
3. Bought it from Amazon with credit card with very big limit
4. Actually don't have any stock, but only bought it from another seller/distributor with big amount when needed.