“Hi, uh, sorry – I’m looking for brains?”
“Hmmm …”
“Brains? Delicious brains?”
“Oh, brains - have you tried down aisle 5? Housewares?”
“Yeah, nothing there. Tried kitchenware, too.”
“Oh, gee, uh …”
“Well, they were in the circular this week, so I figured …”
“Well, brains are pretty popular right now, so there’s a good chance we’re sold out.”
“Do you think you’re going to get any more in?”
“What’s today, Thursday? We usually get a shipment in on Wednesday nights, but if there’s none on the shelves, I doubt if we got any. You might want to try another store.”
“Can you special order one for me?”
“Well, the fact we didn’t get in any last night probably means that they don’t have any at our distributing warehouse. You’d be waiting for quite a while.”
“Well, can you phone anoth-”
“Yeah, no, we don’t really do that. Try checking up at Customer Service to see about a raincheck, m’kay?”
Well, no-one laughed the first time, so I figured I better hit the button twice, apparently …
HA!
and…
Ha!!
I don’t think we can repopulate the species that way. 
I can’t get past the no other survivors bit. Sure, one could live for years using a lot of the good suggestions upthread, but you’d find my pickled corpse in the liquor aisle about a week after the supernova.