CBJN *LINK*
Current BlackJack News is the service provided by BJ21 featuring a paid network of reporters. Many of these reporters discuss their reports on the CBJN forum. They are reputable Greenchippers and are known in the community.
Stanford Wong's reporters throughly canvass all of the casinos in Las Vegas just prior to the fresh CBJN edition which comes out on the third of each month.
If you plan to only purchase one copy, order it on the third of the month that is just prior to your trip.
Me, I keep a permanent running subscription to support such a fine service.
Here's the link to BJ21's catalog so that you can choose their single issue, 3 month, or 12 month subscription: