We have the American Sewing Quild here in the US. It's national. In Florida, we have many retired people. When a wife dies, the husband gets in touch with an ASG ember and donates boxes and boxes of her leftover stash. We use a lot of it for charity quilts since we have so many nursing homes here.
Sometimes, we will divy it up among ourselves. We also have fabric trades. Somebody's "Why did I buy that?" will always look good to someone else.