What is a reasonable offer?

Hi, new to the forum! I am not sure where to post this question however, feel free to move it. I am looking to purchase a used car in the next few days. I am interested in a 2013 certified Volkswagen jetta with 18k on it. the asking price is 13,998 what is the lowest price i should offer in cash and out the door without embarrassing myself? I am on a tight budget and not sure what a dealer will actually go down to out the door.
0
Comments
Navigation?
What engine?
What location?
Is this a CPO from a VW dealer?
Does have a screen but doesn't mention nav in the listing.
Sunroof
2.5L
PA
CPO from a VW dealer.
Does have a screen but doesn't mention nav in the listing.
Sunroof
2.5L
PA
CPO from a VW dealer