We're not sure if this is a placeholder or if the information is accurate, but retailer Pure Mobile has the Nexus 4 charging orb in their online catalog. Currently listed as "out of stock", the OEM built charger is listed for $59.99, with free shipping. If you follow the link below and go to the source, you'll find you can hover over the thumbnail for an expanded view, and it certainly looks to be the real deal -- Nexus logo and all.
We're not sure if this is a sign that we'll soon be seeing the charging orb for sale as we saw with the Nexus 7 dock, and it's a little more pricey than we had hoped (although far less than the last time we saw the charger listed online), but we're certainly keen on getting one. I've reached out to Pure Mobile and will update everyone when they reply.
Source: Pure Mobile