if you are coming this weekend, save yourself all the driving around and just go to the Hannah Dustin annual quilt show, because there will be about 12 fabric vendors there, including Pickering Farm. This is located in the town of Hudson, adjacent to Nashua.
I love the stores mentioned - Quilted Threads, Keepsake, and The Quilt Patch - but if you really don't want to venture too far from Nashua, here are the three closest:
Pine Tree Quilt Shop in Salem
Bits N Pieces in Pelham
The Quilted Shamrock in Hudson
Have fun, and let me know if you need a local escort!