One of the biggest expenses is housing. I would cut that down by living with roommates (search craigslist for rooms to rent).
Second, I would make sure you can get the most lucrative travel contracts you can find. That's means Hawaii, New York, Northern California, etc. You should be getting minimum $40/hr if not $50/hr or more. If you move to Northern California most nursing jobs will give you at least $40-50 an hr and any hospital job should give you $55+ per hour. If you rent a room on Craigslist and work in Northern California, assuming your room is rented for $1,000 and your other expenses are $1,500 monthly, you should be able to save bucketloads of money. ($40-$50,000+ yearly, or certainly at least $3,000 monthly)