I can imagine Chicago is going to prove rather difficult. I wish my LGS shipped and I would give you there info. It does seem that there are areas where they are more plentiful than others.
I luckily only had to look around for a week before I found one. It was pure luck though. I almost settled on a G30 because I have been considering expanding from 9mm only to .45 here and there but I am much happier with getting what I originally set out for.
My LGS did not even know they were getting the 19s in. They were from an order back in JANUARY and they thought they were still a few weeks out at least. Not sure how much the situation has improved in a week but last I heard Glock had some ~80,000 units on backorder. :/ My advice would be to call every store around a couple times a week to check on the stock (most get new stock in daily or a few times a week) or even better, go in the store frequently. Sometimes something may come in and literally get bought up as soon or before it even hits the shelf. Good luck!