Tensun via Amazon offers Prime members its Tensun Unisex Anti-Fog Swimming Goggles in Black for $8.33 with free shipping. That's tied with last month's mention, $15 off, and the lowest price we could find, aside from the color below. They feature clip closure and come with ear buds and a nose clip.

Prefer a more colorful pair? They're also available in Blue for $7.99 with free shipping for Prime members.