(Radio Iowa) – As the world’s largest retailer launches its annual summer sale today (Tuesday), Iowans are being warned to shop with caution. Amazon Prime Days runs through Friday, and Bao Vang at the Better Business Bureau reminds people to think before they click. “Scammers are really great at mimicking official sites with photos and brands and logos that look and feel like legitimate sites,” Vang says, “so just because a website or email looks official, does not mean it is.”

In addition to Amazon, many other companies are offering summer sales, but Vang says you need to be absolutely sure you’re on a secure, legitimate site before clicking the “ORDER” button.  “We suggest at BBB that people use credit cards,” Vang says. “Credit cards offer additional protections when you need to fight a fraud situation. Avoid wire transfers, pre-paid money gift cards, or other cards.”

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She says being vigilant can save you a lot of money in the end, and Vang advises against making a quick purchase through social media, and to always do your homework before finishing a purchase.