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I assume you are referring to “Made-in-china.com” as opposed to Madein china.com?
Both made-in-china and alibaba are just directories that list individual factories and the products those factories supply.
Don’t believe the prices you see quoted on the front pages as they are often reduced to get you interested.
Any dealing you have will be with the individual factories/suppliers, and the only way to get a real idea of pricing is to contact the specific factory directly.
But a word of advice, cheaper prices are often cheaper for a good reason.