Newegg has the Rosewill RSHS-11002 Travel Alarm for $10 - $5 off with coupon code EMCJHNC82 [Exp 12/13] = $5 with free shipping. Hang on the door knob and insert the door clip sensor into the door gap to create and alarm, when tripped will sound 100 dB high pitch alarm.
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fyi these are tricky to turn off once they activate, which can be a good thing.