"想讨便宜的顾客" can be translated into English as "customers looking for a bargain" or "customers hoping to get a good deal".
Both expressions convey the idea of customers who are seeking discounts, lower prices, or advantageous offers. The choice between them may depend on the specific context or nuance you wish to emphasize.
"Customers looking for a bargain" implies a direct search for items at reduced prices.
"Customers hoping to get a good deal" suggests a broader expectation of favorable terms or value for money.