Is there a way to find out how much the discount is before I go to the store ?
You think it’s depends what I buy at the time ?
I don't think you can find out in advance as its a bar code to scan at the store. When you click through the link you get this:
It's no mystery how much we appreciate you being a My Best Buy® program member.
1. You must print this page to scan your Mystery Reward certificate in store. (Barcodes cannot be scanned from a
mobile phone.)
2. Bring the Mystery Rewards certificate to your nearest Best Buy® store by 11/10/17. Ask an Associate to scan it to
reveal the value. If the value of the Mystery Rewards certificate is:
• $5–$500, you may redeem it immediately through 11/10/17 at participating Best Buy stores (not valid online)
• 250,000 My Best Buy points (that's $5,000 in My Best Buy certificates), please call the toll-free number printed
on your receipt by 11:59 p.m. local time on 11/16/17.
3. Redeem your certificate in a single transaction with a total purchase price equal to or greater than the value of the
certificate.
