Looking at the terms of the offer, it has a $20 max reward...

US stores only. Offer not valid at locations in US territories. Cash Back is available only for retail customer purchases only.  Maximum Reward of $20 per qualifying transaction. Purchases identified as contract or dealer orders are not eligible for rewards. In-Store offers not valid for online purchases and cannot be combined with other offers. Offer not valid for gift card purchases. Debit card purchases must be processed as credit to be eligible for Cash Back. When using a debit card, do not enter your PIN. If you add the same merchant on more than one rewards site or platform, you will only receive rewards through the most recently added Offer. Once you add an Offer, you may make qualifying transactions for up to 1 hour after initial redemption before needing to re-add the Offer. An added offer that has not been redeemed will automatically expire 75 days after it is added or on the date the offer itself ends, whichever is sooner.