I love this website, I know it is only for Texans, but there may be similar websites for other states:
Texas3006.com - Your 30.06 Information Resource - Home
They actually have a user-updated database of all of the postings of 30.06 signs around and can be searched by city, business type, etc.
What I found particularly interesting was there really aren't that many businesses on the list. For example, Arlington is a very large nearby city that I do most of my shopping in. There are only 7 businesses listed with 30.06 signs. ONE of those businesses is the YMCA that my daughter takes swimming lessons at, which I've mentioned before that has the non-conforming sign. One of the user comments left about it is as follows:
"I spoke with the Local YMCA manager, YMCA policy is to "Post signage to prevent firearms in facilities" paraphrased As he put it, he chose black letters on dark tint glass so he "posted" even though it is not a valid post. He is a CHL."
I found that really interesting, because I believe somebody on here had mentioned once the possibility that these non-conforming 30.06 signs may be done that way on purpose to make upper-management happy, and also keep CHL people happy. That appears to be the actual case here. Funny that the user who posted that comment was more worried about the black letters on dark glass, when what stood out to me was how very small the sign was. So it looks like the manager went out of his way in more ways than one to make the sign not conform.