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I'm looking to purchase an electric bike to be shipped from China to Sydney. Could you provide details on the models available, their specifications, and pricing? I'm particularly interested in understanding the features that set your bikes apart, as well as any warranties or after-sales services you offer. Additionally, please include information on the shipping logistics and estimated delivery timeframes to Sydney. If there are any bulk purchase options or discounts available, I'd love to know about those too. Looking forward to your prompt response with all the relevant details!