The base Model S is $69,990 (USD) according to Tesla's website and Wikipedia, not $35,000 to $40,000 (USD). With federal tax credits, the base price comes down to $63,570 (USD). With state incentives, it becomes a bit more difficult to qualify the final price: essentially, you can either get a $2,500 (USD) rebate (California), a $6,000 (USD) income tax credit (Colorado), a $5,000 (USD) income tax credit (Georgia), or a $4,000 (USD) rebate for the car and a $3,000 (USD) rebate to offset the cost of electric vehicle charging stations (Illinois).
Considering what I paid for the Model S P85+, I do wish that the base price had been as low as what you originally claimed.