I discovered this amazing store called "Scrap" today. It's essential the living definition of the quote: "One man's trash is another man's treasure.".
Quoting the site the place is:
There were crayons, pens, unused notebook paper, paint, fabrics, for sale by the handfuls. It was every eco-friendly, artist's dream come true. Absolutely brilliant. Thank you, Portland for letting such a place exist.