You can check reviews. I was looking for some Vittoria latex tubes and found a too good to be true price. Amazon reviews were filled with people that took a chance (easy to do for many with low price items) with pictures of failures at the stem, lots of “don’t buy these”.
If there’s no reviews that a sign too. A “good deal” is hard to pass up. No reviews means it’s a “new” storefront (changed often) and another red flag.
You could take the chance. Be the canary in the coal mine. Warn others if it’s bad.
Good luck.