Important: the seller is different. When logged in, the seller is Amazon.com. When logged out, the seller is SHOEBACCA (which does not appear to use Amazon for fulfillment).
If you are logged in and click to see all New & Used options, you can select the SHOEBACCA variant at that price.
My guess is that when you're logged in as a Prime member, Amazon defaults to variants that are fulfilled by Amazon so they can guarantee Prime shipping times.