• start selling my posessions on ebay
• sell parts of myself
• try selling my relatives
• lobby my boss for a pay-rise
• use my black credit card
• code the next killer app (in perl, of course)
• code some killing app (using some evil programming language, of course)
• create my own crypto currency
• start a Ponzi scheme
• get a loan from my bank
• get the money directly from the bank
• print the required money myself
• do something else (please specify)

[Update: added two options as proposed by Tux]