When it comes to online retailers, Amazon is the giant in the room.
While the Prime Visa (see rates and fees) doesn't technically have an annual fee, one of its caveats is that you have to be an Amazon Prime member to qualify. A Prime membership costs $139 per year (or $14.99 per month).
It's hard to assess the value of a Prime membership based solely on the return you might get using the online retailer's credit card — because membership includes so many other tangible benefits — but for argument's sake, we're going to try.
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