Why some electronics products are available in retail shops but not available in company websites ?

i was in need of a Refrigerator so had a visit of near by retail shop. i liked Samsung refrigerator model no. RT42R5588DX there and in search of better price and negotiation i searched this product in online shopping portals but i did not find this model. i was surprised when i did not find this model in Samsung product website too. What is wrong ?

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