美国采购需求：亚克力盒，亚克力展示柜，带盖亚克力盒，亚克力展示盒，透明亚克力盒，定制亚克力展示柜

I'm interested in creating a custom mahjong set and would like to explore the options for personalization. Specifically, I'm considering whether to have the back of the tiles engraved or to customize the faces. Could you provide details on the pricing for both options? Additionally, I would appreciate it if you could break down the cost per set and let me know the minimum order quantity, if applicable. Also, it would be great to know the estimated lead time for production and shipping to Los Angeles. Understanding these details will help me make an informed decision. Looking forward to your response!