Often Michaels and Joann's come out with 20% off everything coupons (even sale items). I like to wait till I have one of those to buy lots of DMC floss. It adds up if you have a big project and not many colors yet.
WalMart ususally has the cheapest prices IF they still carry it in their craft section. One of my local WalMarts stopped carrying DMC floss. Joann Fabric ususally has competitive prices and great to stock up when they go on sale. One of my girlfriends was determined to buy every single color and over the years she finally accomplished her goal .. and guess who got stuck winding her floss with her??? YES! ME!
~You can take the girl out of the country, but you can't take the country out of the girl!