it's $50. On Tilly's, it's $39.97. Sure, it's only about a $10 difference, and it's possible that with shipping charges, it will be a wash. But Tilly's offers free shipping on orders over $99 and Piperlime charges a flat $7.
So what would you get for the extra $17.03 from Piperlime? Probably some cute green tissue paper wrapped around your over priced shoes. Which can be found, incidentally, at your nearest drug store for $1.99.