Here's a great example of the crazy markup. I use these $7 sunglasses for biking: 3M Virtua Glasses Gray Lens, https://www.amazon.com/gp/product/B0006PJHM6/

Here's a great example of the crazy markup. I use these $7 sunglasses for biking: 3M Virtua Glasses Gray Lens, https://www.amazon.com/gp/product/B0006PJHM6/ https://www.amazon.com/gp/product/B0006PJHM6/ And these clear $5 ones for wind while biking when it's dark: 3M Virtua Clear Lens, https://www.amazon.com/gp/product/B00166OALC/ https://www.amazon.com/gp/product/B00166OALC/ Both 3M and Amazon make a profit on these! 3M's cost of goods sold is probably $1.25.