At the Belaggio and Venetian among other places
Sure, if you play at the lowest of limits at places like the casinos you mentioned, you will face a CSM game or in the case of single deck it is all 6/5 on the strip. But that is perhaps 15% of the total tables (if you take out HET properties which lead the world in garbage blackjack)
If you can afford to play for $25 and up per hand, the strip has many 6D games with S-17, RSA, DA, DAS and LS, house edge .26%. This game is available at places like MGM, Mandalay Bay, MC, Trop, Mirage, Belaggio and Venetian amongst a few other places.
There are also decent double deck games on the strip with house edges of .19% or higher.
If you are a $5 or $10 player your options are limited but the two casinos that you mentioned are not that interested in $10 players and do not offer them their best games.
You can purchase the current copy of CBJN....Current Blackjack News on this site and it will answer your questions and save you some shoe leather for just a few bucks.