Not a penny
Definition 1 of 1
Pro Tip 1/3Emphasis on Zero
The phrase 'not a penny' emphasizes that no money whatsoever has been received or given. 
After negotiating, I agreed to sell my old bike for not a penny less than $50.
Pro Tip 2/3Used for Effect
'Not a penny' is often used to make a statement feel stronger or more dramatic. 
They promised to help with the project, but in the end, they contributed not a penny of support.
Pro Tip 3/3Figurative Use
While it refers to 'money', 'not a penny' can be used figuratively to mean 'nothing at all'. 
Although I spent hours on that game, I got not a penny of satisfaction from it.