I highly recommend Harriet Hargrave's book "Heirloom Machine Quilting" Here is a link for it on Amazon, I doubt JoAnn's would have it but you never know. I got mine used and it was like brand new.
http://www.amazon.com/Heirloom-Machi.../dp/1571202366
Diane Gaudynski's "Guide to Machine Quilting" is also very good.
http://www.amazon.com/Guide-Machine-...ref=pd_sim_b_3