Your LEGO Springfield is not complete without the Kwik-E-Mart. Luckily LEGO has announced an official Qwik-E-Mart playset which will be available this May for $200(USD). The set has 2,179 pieces and you also get Apu, Marge, Homer, Bart, Chief Wiggum and Snake Jailbird minifigs.
I’m guessing the Snake minifig is so that you can simulate shoplifting. Then Wiggum can chase him for two seconds and get winded. The store even has a removable roof and the walls are also hinged so you can have access to the whole building.
Now your Simpsons characters can actually shop and feed their LEGO selves. Can Apu interest you in a LEGO Slushie? Just remember, this is not a library.