...one downside is the potential that the dropshipper doesn't follow through, or has lousy customer service, or in rare cases is just downright dishonest. This can hurt your reputation and can cost you $$$ because it's YOU the customer gets upset at.
However having said all that, it's how I got started in business on the internet years ago and highly recommend it. I continue to have a good relationship with my original dropshippers today.
Ron
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