Indeed they do exist. I have both, unopened and and unpunched. They are both a bit beat up, but still, there they sit as proud as day. What an odd thing I have to finally contribute. I don't have anything on their origin on actual store shelves , but there is a toys r us sticker on both. The price tag on them is from a thrift store, where I got them. There was no original price tag on them from a store. I actually went to look at these again after the other PPG combo pack was mentioned earlier, I was a bit disappointed I had the wrong combo pack.
Let me know if you have any other questions - or if anyone else finds any of these out there. Cheers!
GoMordecai's post in Two Game Boy Color Bundles - Powerpuff Girls and Dexter's Laboratory was marked as the answer