$150m vs. $85m doesn't have a material impact on the total cost as per the new PBO accounting.

65 jets at $85M = $5.525B
65 jets at $150M = $9.75B

Total cost of the project is expected to be about $45B, so the $4.5B difference you're talking about represents only a 10% savings.

In fact, even if the jets were free it wouldn't substantially change the cost to "buy" the jets as per the new PBO accounting rules.