My husband is Filipino, and we live in Oak Park; we're always on the lookout for ingredients. Unfortunately, you won't find much in or around Oak Park. My favorite place to shop for Filipino groceries is Unimart in Niles (on Dempster, just a block or so west of Harlem on the south side of the street). It's a jaunt, but you can really stock up. Their takeout is good, too; we recently catered an after-holiday party with their lumpia and pancit.
My husband also makes regular trips to Chinatown for supplies. He's been going to the same place for lichon since he was a kid. Fortunately, he's a good cook, so we usually don't go out for Filipino food. He made panakbit the other night with bitter melon he bought at the Oak Park Oriental grocery on Madison; that place is hit or miss, but it happened to be good that day.
Unimart One Stop Shop
5845 N. Clark St., Chicago, IL 60660
773-561-8667
7315 W. Dempster Ave., Niles, IL
847-663-8388
1038 W. Golf Rd., Hoffman Estates, IL
847-755-1082