Is there any discount on this laptop?这个笔记本还能便宜点儿吗

今天的几个句子是有关买电脑的：1. It's already very cheap. 已经够便宜的了。2. Alright, I'll buy this one.  好吧，我就要这个。 3. Can I pay using a credit card? 我可以刷卡吗？