Learn English – What does “chow-wow” mean here

You have to understand it in its context. Earlier, Al Swearengen said:

...First come when I was watchin' you and them lawyers on line this morning. They began to slither in my sight like vipers. So as not to puke, I had to close my eyes. The vision went on. Got worse. I saw the vipers in the big nest in Washington. They were takin' us in the camp for actin' like we could set out own laws up or organizations and then saw the big viper decide to strangle and swallow us up every fuckin' thing we gain here

So, "vipers" here is referring to the judge and the lawyers.

The trick to understanding this advert comes at the beginning:

Here’s introducing iDiva: Five Magazines in One

So the publisher is saying their magazine is the equivalent of five other magazines.

Also they are selling the first issue at a cut down introductory price:

At an introductory price of Rs 5 per copy

So, in their mind, the magazine is cheap even compared to a normal magazine, but because it is five magazines in one, the cheapness is exaggerated by that multiple, so this deal is five times better than any normal discount on a magazine, i.e. five times over.