The best deals at Costco aren’t necessarily where many shoppers are looking. Jacquelyne Devine, a content creator from Pennsylvania who posts under the handle @costcojacque, spends a lot of her time investigating Costco offers.  While many Costco customers rush for the rotisserie chickens or bulk staples, she and other shoppers and fans, she said, have found the bakery to be the site of the warehouse’s biggest bargains.  She shared some insights from her perspective.  1. Try the loss-leaders in