that and a dollar will get you a cup of coffee

Etymology
Implying that a dollar is the cost for the coffee, leaving the other item worthless.

Phrase

 * So you can name all the Chinese provinces? That and a dollar will get you a cup of coffee.
 * So you can name all the Chinese provinces? That and a dollar will get you a cup of coffee.

Usage notes
There is a large variation in the monetary value mentioned, with a dollar being one of the more common. The product to be purchased may also vary.