Walmart offers the Westcott Full Size Retractable Ceramic Utility Box Cutter 2-Pack for $6.67. Choose in-store pickup to avoid the $5.99 shipping fee. That's the lowest price we could find for two by $5. (We saw one for $3.44 last month.) Each retractable utility cutter comes with one blade.
With these companies, it might be easier than you think to negotiate your monthly bill down.