Social media influencer Thaddeus Yan popularizes Trader Joe's mini-coolers, driving sales and price increases on eBay.

Trader Joe's tiny coolers are trending, with social media influencers like Thaddeus Yan helping to drive sales. Yan, who paid $3.99 each, bought two in bright teal and one in hot pink, both with prominent TJ's branding. The mini-coolers have already been listed for several times that price on eBay. This is another example of how influencers are changing and accelerating the way certain retail products go viral.