The frenzied shopping days that follow Thanksgiving, including Black Friday and Cyber Monday, are nearly upon us with promises of deals and discounts and risks of impulse purchases and overspending.

For those who plan to shop online, a little preparation can lead to extra savings and other benefits.

If you have a credit card or participate in airline or hotel loyalty programs, you may have already seen emails urging you to use their shopping portals or browser extensions. That’s one option for extra benefits, and here’s how it works:

With click-through sites, an online shopper would start there and then proceed to the website they’ll actually shop, earning extra rewards for doing so. For example, those who want more United Airlines miles would go to the carrier’s MileagePlus shopping si

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