By Tony Owusu Walmart Plus, Target Shipt, Costco, and Sam’s Club could be options for people who want to dump Amazon Prime after it raised prices. Amazon (AMZN) – Get Amazon.com, Inc. Report dropped a bombshell during its earnings call Thursday when the company confirmed that it was raising the subscription price for its Prime premium service to $139 a year from $119. The $20 price increase may seem steep for a company that reported an operating profit of $3.5 billion in the fourth quarter, but Amazon clearly thinks it has the juice to pull off this price increase on its more than 200 million …