Hmm, that sounds a bit too good to be true. Some additional things to check:

How many reviews does the site have? If it's just a handful, they could be fake. Legitimate sites will have hundreds or thousands of reviews.
Do the reviews sound genuine? Fake reviews often sound overly enthusiastic and generic. Check for specific details and experiences.
Is the site securely encrypted? Look for "https" in the URL and a lock icon in the address bar. Unencrypted sites are not safe for payments.
What payment methods do they accept? Reputable sites will accept major credit cards and PayPal. Avoid sites that only accept wire transfers, prepaid cards, or cryptocurrency.
Does the site have a verified business address and contact information? Legitimate businesses will have this clearly listed.
Is the product significantly cheaper than elsewhere? If it's a very popular or in-demand item, prices won't differ too much between sites. Large discounts could indicate counterfeit products.

If anything seems off, it's best to avoid the site altogether. When in doubt, shop from a well-known and established retailer.
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