It's not unreasonable asking for a 20% discount, getting it becomes another matter as many factors come into play, under Navigation, did you read this link ? " How Do You determine A fair Price for a Used Vehicle.

Paying cash don't hold water, under Navigation surf to " paying cash ,what's your best price'

When looking to buy 01 - 02 cars, the #1 factor becomes CONDITION, not - make - model - price -

As for how much dealer may have paid for a vehicle selling for 10K,,, could have been 6 to 7K, recondition anywhere from $600. to $1200.