Don't eat,it works
Just buy what is essential and really essential. Although I don't seem to have the willpower this tour to save,for the last one I wouldn't eat unless I had to and then I would the cheapest thing,spend no babysitting money or birthday money,didn't eat at the cinema,no clothes/cds etc. Saved a grand in 9 months.
I would say eBay but it's hard to get good money on there atm. 300 is 2 weeks seems a bit impossible but good luck!