Where can I get a power supply for Alesis Multimix 8 Firewire??

Hello everybody, I'm from Argentina, and I'm coming soon to San Francisco. I would like to know, where or how can I get a power suply for my Alesis Multimix 8 Firewire.
Ac/ ac adpator
Model No. 57T-1800700x2UL
Input: 120v-60 Hz 0.4A
Output: 18-700 mA x2

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