$24 is all you need. I am assuming that your crawlspace does not have ANY black plastic in it. A roll of 6 mil black plastic is about $24, and should cover your crawler.
Read the post titled Hey He's not GUTTERLESS! (about 4 below yours) and follow the directions there...
If you do have black plastic, post back with more information about your house, and we'll try to help you out...
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