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I have the jar attachment for my seal a meal, while alot of air sucks back in when you crack open a sealed jar, I did an experiment, I put an ant in a jar and sealed it.. The thing survived until I got bored and let it out 30-60 mins later. I would think a vacuum would aid in moisture...

$5 shipped for a humidity controlled switch. http://www.dx.com/p/diy-humidity-switch-controller-module-blue-172538 That, a 5v fan and a 5v 1 amp power supply will run you $10 total shipped. Power the switch with the 5v supply, jumper the fan and power supply to the relay to turn the fan on/off...