I picked up a bunch of back issues at a yard sale and love those magazines too. Paper piecing is so fun! :)
If your local fabric store doesn't carry any, you could subscribe through the website or get back issues at a good price on Ebay. :)
Here are my search results on Ebay:
http://search.ebay.com/search/search.dll?from=R40&_trksid=m37&satitle=Quilts+with+Style&category0=
http://search.ebay.com/Foundation-Piecer-Magazine_W0QQ_trksidZm37QQdfspZ32QQfromZR40QQssPag eNameZRC0021?_trksid=p1638.m120
Here is a link to the web site...
http://www.quiltswithstyle.com/
Good luck!