I've never had these but have heard people speak of them in hushed tones. Does anyone know if there's ever a way to find them in Chicago? I understand they travel/keep really poorly.
Maybe look for a jam you can have shipped? Best strawberries I've ever had I picked in the Swiss alps on trails (but not too close...yuck.) Intense, sun-warmed and...oh man so good! I've found lots of wild strawberries all over the US and I've definitely seen jams/jellies for sale but the higher/cooler you are the better. Or maybe I just think that because of the thin air messing with my brain.
...but if you're looking for the white ones I have no clue.
I totally understand your desire. Personally, I'd do bad, bad things to get my paws on fresh cloudberries.