Can I slaughter an animal with a dual intention of fulfilling a vow and making a sacrifice for Eid?

Dear Sir, I have vowed to slaughter a sheep when my father walks out of the hospital but then I learnt that The Food Bank is doing an offer for Eid to slaughter sheep for 1,200 EGP instead of 1,500 EGP. Can I buy them at this saving rate and have them slaughtered in Eid or I should conduct the vow in another different day and time?

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