I'll take two if you can give me a discount如果再便宜点儿我就买两件

今天的几个句子是有关讨价还价的：1.The purchase price is less if you pay by cash.付现金的话, 价钱便宜些。2.This suit of clothing is more inexpensive than that sheath. 这套衣服比那套便宜。3.That's the lowest price.这是最低价了。