Yesterday when I trekked out to the hinterlands of Morton Grove to get my cast off, I noticed this little spot just at the beginning of the strip mall in which my doctor had his office. Based on a couple of comments I made inside the office, most of the staff is scared of it, even though they do carry the basics for the natives.
The maiz and ube (purple yam) ice creams were side by side in the display case, so I asked for a taste of each, and ended up getting a cup with a scoop of each in it. The ube ended up being relatively uninteresting -- honestly, it ended up seeming like sweet cream ice cream to me, little flavor that I could find beyond the basics -- but the maiz was wonderful, each bite flavorful, packed with corn kernels, more savory than sweet. Were I not so far from my home, I'd've been happy to pick up a quart.
They also have jackfruit, calamansi, halo halo, and other flavors I left for later experimentation.
Don't have the exact street address, but they're in the 5700 block of Dempster, just west of the Edens, in Morton Grove. That's a day trip for me, being an adherent of public transportation, so I'd love to hear about any sources nearer the city.