That's how I keep construction paper in the house - Joann's coupons.
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One other place to get almost thigh high (haven't measured it for a long time) with clean white paper on a roll is from your local newspaper office. My local one has the rolls from that days' printing in the front, usually 3 to 5 dollars depending on size. One thin roll has lasted me for 5 or 6 years, plus being used for clothes patterns and some children's play. About the same amount left at least.