I get ripstop seconds at Outdoor Wilderness Fabrics, or other sellers that provide fabric and notions for outdoor gear. Most of the places you mention might have 1.6 or 2 oz per yard ripstop nylon... actual 1.1 in breathable DWR or waterproof don't occur locally, for me.

For fleece or wool, sure, there's a lot of places to scrounge it up on the cheap.
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