Woot offers allbirds Unisex Sugar Zeffer 2 for $9.99 (orig. $40). Free shipping for Prime Members.

Product Description:
<br /> With a sugarcane-based material that’s soft in all the right spots and cushiony where it counts, the Sugar Zeffer is about to become your new summer staple.

• Sweetfoam® EVA (made from sugarcane)
• Best for: Casual strolls, sunny skies, maybe even a poolside soirée
• The perfect blend of bounce & cushion
• Engineered with the world’s first carbon negative green EVA
• Imported