U4 advertising - prepositions preceding nouns

Today we have a special offer of three loaves of bread ___ the price of two.

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You can buy these shoes ___ a 50% discount only this weekend.

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Today's buy-two-get one free offer is ___ all cakes in the store.

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Get ___ 30% off on selected toys during our summer sale.

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Buy one pizza and get the second one ___ half price.

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This offer is available ___ one week only.

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Our clearance sale has discounts ___ 70% on all clothing.

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All frozen yoghurt in the frozen aisle is ___ offer this weekend.

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Students can enjoy 10% off ___ all books in our store.

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We offer free shipping ___ orders over $100.

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