Understanding game sale

In this month of dec there is heavy sale on games on ps store but i dont want to buy any game because of my exams ( cant ask my dad to pay ). Like in steam every now and then there is a discounted price on some games so is it the same for ps store too ? Can i buy the games at the exact same price maybe in feb if there is a discount on them. So the sale is every now and then or it comes like once in a blue moon. [ new to ps so dont be brutal on me ]