Abacus24-7 via Amazon offers Prime members a Google Nexus 4 (LG E960) Bumper Case
with free shipping
. (Non-members can get free shipping with orders of $25 or more; otherwise, shipping adds $4.99.) That's $3 under the lowest total price we could find for a similar OEM knockoff bumper case elsewhere. Sales tax is added where applicable. It features built-in volume rocker and power button extensions, holes for the mic, front-facing camera, and speaker, and more.
Note that this isn't an official Google bumper case.