Do you have some old AT power supplies around... if not you can get some for mighty cheap.. Procooling has a great article on how to wire up power suppplies in series and in parallel. The 120Watt 24V peltiers are only 8 amps. Two 300W AT supplies running in series should be able to supply that. ie Two 12V lines at 8 amps in series make 24V at 8amps.... HOWEVER. like the article says.. do not attempt to do this if you're not sure what you are doing.... get a knowledgable friend to help you out.
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