The monthly cost for an Amazon Prime membership has gone up, the company announced on its Prime membership website Friday. The monthly cost will increase from $10.99 to $12.99, according to the site. The monthly membership includes access to Prime Video, free two-day shipping, unlimited music streaming, unlimited photo storage, unlimited reading and free same-day delivery. Amazon still touts the annual $99 per year membership fee as opposed to the monthly cost. The annual fee remains the same.