last or final bid of the bargaining or negotiation (normally used in negotiating the price of buying or purchasing something)
Definitions (粵典–words.hk)
名詞
定好咗就唔再更改嘅價錢 a fixed price, no more bargain
你有心買嘅話，我一囗價十蚊賣俾你。
你有心买嘅话，我一囗价十蚊卖俾你。
nei5 jau5 sam1 maai5 ge3 waa2, ngo5 jat1 hau2 gaa3 sap6 man1 maai6 bei2 nei5. If you really want it, I can give you for a fixed price of ten dollars.
Definitions (Wiktionary)
noun
fixed price (that does not allow bargaining)
Definitions (Kaifangcidian)
實價 – 实价
言無二價 – 言无二价
鐵價不二 – 铁价不二
Definitions (兩岸三地生活差異詞語彙編—Two Shores Three Places)