If you want something really cheap, go into a fabric store. They sell the fleece by the yard. They even have some nice camo patterns, along with almost any other pattern that you can think of. Get one of the nice ladies who work there to cut you a couple of yards. Once it is cut, you do not even need to sew it. Just use...
And you can scrounge for a zippered pouch to put it in.
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Darwin was wrong -- I'm still alive