Attention shoppers: Now may be the time to purchase a Costco membership. UBS US Hardline & Broadline and Food Retail Analyst Michael Lasser told Yahoo Finance (video above) that the company likely sees the current moment as “an opportune time to charge a little bit more for the members because we’re delivering so much value to them.” UBS holds Buy rating on shares of Costco and $575.00 price target. “I suspect that they’ll announce it later this spring and implement it early this summer,” Lasser said. “What they find is that as they get the profit infusion from this fee, because it really is pure profit, that they take a…