美国采购需求：网球发球机，网球训练机，网球机，网球训练机，网球训练器，DT5

I'm interested in learning more about your tennis ball machines. Could you please provide the current pricing along with your availability? I'm looking for options that fit a range of budgets and would love to know about any special features that come with your models. Additionally, if you have information on bulk order discounts or promotions, that would be great! Please let me know about the shipping timelines as well, as I'm eager to make a decision soon. Looking forward to your prompt response!