Why would the oysters need a convenience store?
ᵈᵒⁿ’ᵗ ᵃᶜᵗᵘᵃˡˡʸ ⁿᵉᵉᵈ ᵃⁿˢʷᵉʳ ⁻ ᶠᵃˢᵗ
Maybe the only convenience at the store are fresh oysters…
The oyster and battery vendors formed a joint venture. He sells C-cells, she sells sea-shells.
Wow. There’s a lot more left than I expected there would be.
I think you just found Atlantis. 
It’s not battery vendors, but Unix programers. Those are C shells.