What would you say when …?

(At a clothing store)
Gabriel: How much for this sweater?
Salesperson: For you, considering family and friends’ discount, $ 75.
Gabriel: Wo Wo! That’s too steep, work with me on this.
Salesperson: All right, $ 70.
Gabriel: Come on, I am a regular here. You CAN do better than this.
Salesperson: Fine! $ 65, and ……………… .

Meaning: I can’t give you a lower price. That’s the lowest price I can offer.

Hint: I a- a------ l---— m----

Answer: I am already losing money

More examples: Let me make a final offer. Pay me $ 400 and the cars is yours. Can’t make it any less, I’m already losing money.
He said he wouldn’t give it for any less than $ 700 and he was already losing money, but I could vividly tell he was lying.