According to the National Retail Federation, projected spending for St. Patrick’s Day could exceed $5.3 billion (the highest in its survey history), with average spending of $37.92 (up from $35.37 last year). Those ages 25 to 34 spend the most ($46.55 on average). Expenditures include food and beverages, clothing, and decorations. Hallmark offers 47 different items for today.