By Jeff Somogyi, dealnews Media Editor Maybe you missed it, but this week Best Buy made a huge mistake that wound up costing the retailer a lot of money. On Monday, it released a printable coupon that took $50 off purchases of $100 or more with payment by MasterCard. It's a great discount, but it was particularly notable because the store apparently forgot to double-check the list of exclusions. Normally, these types of discounts exclude Apple products and (especially) gift cards. But not this time. Eagle-eyed consumers around the country exploited this error by buying $100 Amazon Gift Cards for $50 ... and then returned to the store with a new coupon to do it again and again. Some wound up purchasing thousands of dollars worth of cards for, essentially, 50% off! Best Buy realized its error before the end of the day on Monday, and cancelled the promotion, which had been slated to run all week. But the damage was already done. What is most interesting about this typographical error, however, is how it has striated the Internet. For every "Aw, man, I can't believe I missed it!" post, there are an equal number of commenters saying "Using this coupon is tantamount to stealing!" On which side do you fall on this dilemma? Is all fair in love and deals? Or should consumers show restraint? Sound off in the comments below! Front page photo credit: Amazon Related dealnews Features: iPad mini Refurbs Will Hit the Apple Store in May at Sub-$300 Prices The Most Ridiculous Tech From CES 2013 After Target's 'Epic Retail Fail,' Is It Clearance Time for the Collaboration Craze? Jeff Somogyi is the dealnews Media Editor. See more of his thoughts on Google+, Twitter, or on his blog. Follow @dealnews on Twitter for the latest roundups, price trend info, and stories. You can also sign up for an email alert for all dealnews features.