Normally Connecting Threads gives you free shipping on orders of $50 or more, but you can use the following code to get free shipping on lower-dollar orders:
FPFRESH - I used this code just a few minutes ago to get some more of those Mirage fabrics for $2.96 a yard :mrgreen:
Also you can try APQFRESH. I haven't tried it myself, but it's supposed to give you free shipping too.
Both expire 6/1/11 according to the retailmenot website. :)