Do you have the offer in writing?
Since dealerships need to reach quota to get their incentives, they can be desperate for sales when the month sales period ends. In other words, they are willing to lose 2K on a car if it means they will get 30K in incentives from the manufacturer for reaching their sales goal.
Find every Jeep dealer in the area and on the last day of the month see what they can do to give you a better price. It might work...
As mentioned, dealers don't make much money on cars. They make buckets of money on fine print. All the warranties, added services, financing, fees, etc. You are hurting their bottom line by paying cash. Finance it, make sure you're not paying additional fees to finance and can pay off at any time. Then, immediate pay off the loan in full. You will get a better price on the car since dealer is expecting to make extra money through financing.
You might find this
TIL podcast interesting.