Not sure how long it has been there, but the Nexus 4 bumper is on Google Play now. It will probably go on sale the same time as the Nexus 4.
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, Almighty God! I know not what course others may take; but as for me, give me liberty or give me death!"
-Patrick Henry, March 23, 1775