Instacart is launching a national campaign titled "Summer Like It’s 1999," which embraces '90s nostalgia while offering discounts of up to 47.2% on popular products from that era, such as Capri-Sun and Bagel Bites. The campaign, featuring music and visuals reminiscent of the decade, aims to resonate with consumers reflecting on their childhood summers and seeking value in grocery shopping amidst inflation.