I would put a wanted ad on craigslist in the Arts and Crafts section. You never know what quilter out there might be cleaning out. Be sure and ask that they contact you via email with a description of what they have. Then you can screen them by calling. You can always ask to meet at a store or coffee shop.
I met the most wonderful quilter answering an ad.
I also suggest seeing if there are any quilting groups around. Sometimes they can hook you up with someone or a quilt bee that has scraps they dont want. I know several ladies who do not like using scraps. I adore scraps.