Bitdefender 2018 Coupon - 60% OFF

1. Cheaper on sale at BestBuy.
2. Never, but never, give Bitdefender your credit card.

Better coupon: RENEWAL-EXP-24.99
Price goes down from $89.99 to $24.98 (USD, I believe, although the email I received with the coupon said it was CAD)

And as @JAC mencioned above, never give them your credit card, as they will charge the renewal the next year in an outrageous amount. Use Paypal instead, and remember to log into Paypal and cancel the subscription it creates, once the purchase has been completed.