大だいサービス

noun

big treat; great offer; extra service

Used when a shop, business, or person provides something extra or at a special discount, often to attract customers or show generosity. Colloquial and friendly.

• 今日きょうは大だいサービスで、全ぜん品ぴん半はん額がくです！

  Today's a big treat: everything is half price!

• あの店みせはいつも大だいサービスしてくれるから好すきだ。

  I like that shop because they always give great deals.