check the classifieds & free offers here on the board- often members are passing along-sharing scraps for just the cost of postage. also, check the local guild- members often have scraps to share- one of our local quilt shops always have a large basket of scraps and quart size ziplocks- you can stuff a ziplock as full as you can get it and still zip it closed for $5- they generate a lot of scraps from doing store displays and like the rest of us can be over run by them if they didn't decide to (share).
you could check with your lqs & mention that some shops do this instead of throwing them away.