What is up with Amazon?

Our quilt guild is doing a quilt from Judy Martin's Knockout Blocks and Sampler Quilts for our Block of the Month quilt this year. I bought the book from a quilt shop a couple years ago for $21. It is listed on Amazon through different sellers for $57, $65 and even $131.05!!! I have no idea why it would be so much on Amazon. I found it online at a quilt shop for $20 and I may contact them. We are also contacting some local quilt shops to find out if they can get the book and what their price would be.

If anyone happens to know of a place we can find multiple copies of the book for a reasonable price ($20 or $21 is doable...$57, $65 and $131.05 are not) please let me know.