One thing that just occurred to me is that your utilities will be lower from only using them 3 days a week (although you depending on where you live you might still need enough heat that your pipes don't freeze.) Also, you could consider cancelling cable, internet, and phone -- use a cellphone, get a bunch of DVD's for entertainment, and do your email while on break at work.
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financial checklist:
[x] emergency fund fully funded [x] no cc debt [x] >10% to 401k
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