What does "How Cheap Can You Get?" in this picture means?

Question

What are they talking about? I don't get it. Any help will be appreciated.

and I didn't know which category to ask this Q...

http://images.google.com/imgres?imgurl=http://artfiles.art.com/images/-/How-Cheap-Can-You-Get-Print-C10100693.jpeg&imgrefurl=http://www.art.com/asp/sp-asp/_/pd--10100693/How_Cheap_Can_You_Get.htm&h=450&w=359&sz=51&hl=en&start=1&um=1&tbnid=WmXRfFzGOOjuNM:&tbnh=127&tbnw=101&prev=/images%3Fq%3DHow%2BCheap%2BCan%2BYou%2BGet%253F%26um%3D1%26hl%3Den%26sa%3DN

Answer 1

Hard to tell without getting the context of the book.

Answer 2

This is about prostitution, those two women have just finished up with  those two men in the background and it's clear they're still at work, so they are cheap

Answer 3

Cheap: Worthy of no respect; vulgar or contemptible.

Clearly the risque apparel of the two women indicates that they aren't worthy of respect- that they are vulgar and contemptible.