Crocs via eBay offers its Crocs Unisex Specialist Vent Clogs in White for $9.49 with free shipping. That's $4 under our mention from three days ago and the lowest price we've seen. (It's the best deal now by $15.) They're available in men's whole sizes from 8 to 13 or women's whole sizes from 10 to 12.
These freebies are available to anyone with an internet connection — including those without an Amazon Prime membership.