英国采购需求：近视太阳镜、男士太阳镜、设计师太阳镜、男士太阳镜、太阳镜、女士太阳镜

I'm interested in developing a custom pair of sunglasses and would like to gather some details before proceeding. Could you provide me with the cost associated with creating the mold for this design? Understanding the initial investment is crucial for my decision-making process. Additionally, I would like to know if it's possible to obtain samples prior to placing a bulk order. It's important for me to test the design, particularly the double temples, to ensure they meet my expectations. Your prompt response would be greatly appreciated as I'm eager to move forward.