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I'm interested in purchasing speed stacking cups, specifically the Blue Yuxing model from the latest generation. Could you provide me with information on where I can buy these cups? Additionally, I'm looking for options to purchase other varieties of speed stacking cups as well. It would be great to understand the available choices, pricing, and any bulk order options you might have. If you could also share details about the shipping process and estimated delivery times, that would be super helpful. I'm keen on finding a reliable supplier for these products, so any recommendations you have would be appreciated! Looking forward to your response.