Update: It looks like the HSPA+ connected Nexus 7 is back in stock at the Play Store, at least for now. Those of you still hoping to get your hands on one would be well advised to claim yours now.
If the newly-released Nexus devices were people, then what we've been seeing is nothing short of that Texas Chainsaw Massacre sequel Cameron can't wait for. Both versions of the Nexus 4 have already dropped like flies, as well as the 32GB Nexus 10. Now, the 3G-connected version of the Nexus 7 is also sold out. Not too shabby.