Retailer:
Costco

 

Kirkland Signature Men’s Pima Cotton Polo, $12.97

https://www.costco.ca/kirkland-signatur … 98147.html

Colours : black, dark blue, grey or blue

Seems made of good materials: 85% cotton, 10% silk, 5% elastane

Buy 6 or more items, save 25%

May be available In-Warehouse at a lower price, but in-store selection may be more limited.

The US Costco website has some reviews for this item:
https://www.costco.com/kirkland-signatu … 45918.html