爱沙尼亚采购需求：网球穿线机、网球拍穿线器、网球拍穿线器、羽毛球穿线机、穿线机、羽毛球穿线机出售

I'm in the market for a reliable badminton stringing machine, as I plan to string around 5-20 rackets each week. I've seen various options online, and I think one model could be a great fit for my needs. However, I noticed there are many sellers on Alibaba. Can you let me know which seller is associated with your factory so I can be confident about the quality? Also, I've seen a significant difference in delivery prices for different models. Why is the shipping cost for the preferred machine notably higher compared to others? Understanding this will help me make a more informed decision. Thanks!