If you're looking for bright colored flannels, we're doing a swap of 5" charms this December. I have some lighter ones but they are not quilt shop quality. I highly recommend finding a good quilt shop for flannels or they will ball up with just a couple washes.
If you're looking for quilter's cottons, maybe you could list a private swap.
Keepsake quilting is a great site/catalog. I pour over the catalog making want lists but havent' had a chance to order yet.
http://www.keepsakequilting.com/
Hancocks of Paducah is another site I love to drool over
http://www.hancocks-paducah.com/