Our local quilt shop has many classes, any scraps (including those selvage ends) that we don't want to take home are thrown in basket...upfor grabs for those of us there for the class and then are put in bins and availabe for purchase by weight. The shop goes through and sorts out the useable and separates into colour families. Please check with your local quilting. Shop to see if they do similar.
One of our quilters who took a work assignment up north (further north then where we are - so really north) decided to do a postage stamp quilt by hand while she was away. We all put one inch scraps of unique fabrics in a separate basket for her and the shop kept mailing them up. You never know if you support a local shop and ever need a favour they will look out for their own and try to help.
Hope you find what you need.