CBJN
Current BlackJack News is a list of conditions of almost all the games in the US and many in Canada. It is put out by Stanford Wong and is available to purchase right on this site. Either a yearly subscription or monthly issues are available. Its not really a magazine more like a spreadsheet showing pen, # of decks, limits, rules, etc and it is organized by region. Stanford does his best to keep the conditions updated every month but this is not possible in all of the out of the way locations and tiny towns spread throughout the US.
Here is a link to purchase it