Tactile Fabrics: Everything is 20% off and it looks like many items are already marked down making it a total of 25% off.
Contemporary Cloth: Everything is 20% off (25% for newsletter readers) and free U.S. shipping for orders over $35 (50% off shipping for international orders.)
Fat Quarter Shop: Everything is 25% off.
Marmalade Fabrics: Spend $50 on fabrics or patterns and receive $5 off your order.
I got all this information from the shop's websites and/or newsletters. Click on the links for more details and the coupon codes.