英国采购需求：豪华音乐机芯，豪华木制音乐盒，音乐机芯

I'm interested in sourcing a wind-up mechanism that plays the theme from Paganini's Rachmaninoff. I'm curious about the specifications you offer, including any variations in models or designs that might be available. Additionally, it's important for me that the key for winding up the mechanism is located underneath for ease of use. Could you provide me with more detailed information regarding the available options? I'd also appreciate a breakdown of the pricing for each model you're able to offer. Looking forward to your prompt response with the details.