What can you do for 4 Star Trek crewman with a $100 budget and 2 weeks to go before Halloween (or your next convention). Well here you go, I know it doesn't meet the accuracy standards of the many fine cosplayers here but my three sons were very happy to be my crew.
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The tunics are modified long sleeve cotton T-shirts (yes I know my yellow is way to bright - I'm calling it the "animated version"). The phasers and tricorders are made from cardboard and a lot (really quite a lot) of duct tape and some miscellaneous greeblies. The communicators are modified $1 disney princess flip phones painted black and gold and painstakingly drilled until 4AM one evening.