No, cuando fui a la tienda la oferta ya (terminarse) y no tengo mucho dinero ahora. (pretérito perfecto o el pluscuamperfecto)

No, cuando fui a la tienda la oferta ya había terminado y no tengo mucho dinero ahora.

Explanation:

No, when I went to the store the offer was over and I don't have much money now.

The past perfect past tense (from Latin plus quam perfectum, "more than perfect"), or antecopreterite in some countries, indicates a past action that occurred before another one also passed, that is, prior to another past tense. ("When I arrived, I was already dead").