This post is for everything who is saying "I don't think" this is Epson Photo Paper at CostCo . I found it very hard to believe also because I am a firm believer in Epson Photo Paper and it is expensive. But, it is true and I have been buying 100 packs for $20 at CostCo for the last year. My CostCo always has it in stock.
From the Epson website, the description of this paper is: Glossy Photo Paper, 8.5" x 11", 20 sheets (formerly EPSON Photo Paper). It is NOT the "Premium Glossy Paper", which is a new version of the paper that came out about 6 months ago.
This is much cheaper than you will find it anywhere else. It is not inkjet paper or anything else substandard. It is top-of-the-line photo paper, although now Epson has the new "Premium" paper. Don't let that fool you, as this paper is awesome.
The paper at CostCo even has the same base part # as the 20 sheet packs, S041141. However, the part number is S041141-100.
It is even on the CostCo web site for $19.99 for 100 sheets. I'll try to link, but if it doesn't work just go to
www.costco.com and search on "photo paper".
CostCo Epson Photo Paper
I cannot comment on the paper mentioned for sale at Sam's...