The nations that would be able to provide that kind of money, most of them belong to alliances, they would much rather give it to a member in their alliance who needs it.
Can't blame you for trying, but imagine you were a large nation and you came across this post. A member who you don't know asks for obsurd amounts of money, tying up all their slots and they don't even have the courtesy to say please!
Best of luck trying, but to be honest, I think you would be better off joining an alliance and doing tech deals.