Open https://www.bestbuy.com/gift-card-balance. Choose the physical or e-gift path that matches what you are holding.
Enter the 16-digit number and 4-digit PIN (on the back, or in the original e-gift email). Submit only on Best Buy’s page.
If the e-gift tab is the wrong place, switch — CashStar-issued codes belong with e-gift help, not the plastic fields.
Combine Best Buy coupons with discounted gift card inventory from Checkout Saver.
Plastic uses the 16 + 4 fields on Best Buy’s checker. E-gifts follow the e-gift / CashStar path on the same official page. Mixing the two is the usual ‘invalid’ result.
No. We link to Best Buy and stop. A CS-hosted PAN field would be a fake checker, which we do not run.
No. Membership and Geek Squad credits sit on the account. Gift-card dollars are a separate tender you can spend (or later sell) on their own.