Bargain hunters should make one quick change to their Amazon account this evening — or risk missing out on the “lowest prices of the year so far”, the Seattle-based shopping site has cautioned. Prime Day is a blockbuster 48-hour sale that promises ludicrous discounts across some of the most popular products on Amazon. Teasing the annual sale, the US retailer promised “hundreds of thousands of deals on a wide selection of popular brands like Elemis, ghd, Ninja, and Samsung, and Amazon’s lowest prices of the year so far on select products from Barbie, L’Oréal Paris, Shark, and more.” The Black F…