This is a common problem when trying to private label products that are already saturated or controlled by strong suppliers.
If manufacturers refuse, it often means the product is protected by design, patents, or exclusivity agreements, and producing it could risk legal issues.
If they are already selling on Amazon, then you would be competing directly with your own supplier, which usually kills margins. When prices are too high, it means the product may not be viable unless you can innovate, bundle, or target a niche segment to justify higher retail pricing.
The best way forward is to refine your product idea by adding unique features or differentiators, broaden your search beyond Alibaba to trade shows and sourcing agents, or pivot to a product category where suppliers are more open to working with new brands.