Simply Frugal reader question

Sonja posted a question over at the Simply Frugal Facebook page that that I thought you could help her answer!

Hi everyone – I have a question regarding Costco toilet paper and paper towels. Has anyone done a cost comparison to see if both can be purchased elsewhere for cheaper than the Costco brand? Taking into consideration size of rolls etc? Thanks!!

So, do you think you can help Sonja out? 🙂