Go as a group
Travelling with others is also a way of getting more for less. There could be offers and discount packages for bigger groups of people which will be a huge win for your wallet.
When you're many, you can also agree among yourselves to divide costs whether it's fuel or food expenses. Consider gathering more people for this trip and you could all have the advantage of saving more.
Limit your current spending
The earlier you save, the better your trip will be. And the plans to save should start as soon as possible because December is right around the corner.
You might have to avoid going for expensive lunch dates or partying every weekend for now because every coin is important. It will all pay off when you realize you have some back up money to sustain you after the trip is over.
Have a flexible plan
With enough creativity, you can think of multiple ways to save. For example, you can pack some food instead of buying some along the way on the day you're travelling or have a camping experience rather than book an expensive hotel.
Just think of those details that could help you save more than you already have.