I do go out there, but I do the "stumble upon it" travel route, but there are quite a few quilt stores and the most popular one just slipped my mind - I 'll repost if I find/remember it.
however, Cabella's is near Kutztown- another strong amish/menonite & farming community - you may want to do a google search for quilt stores in near Kutztown (Cabella's is actually in Hamburg- another google search.). just read about someone purchasing fabric at "Wooden Bridge Dry Goods in Kutztown- in the link I tried to post below.
this is taken from a saved thread from this website from spring 2011- you may want to google this thread:" going on a lancaster PA Shop Hop Saturday". I have it saved as:
[URL="http://www.quiltingboard.com/t-115777-1.html"]
I would google these quilt shops- for they may not be around or too far from your itinerary
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Dutchland quilt patch on rt 30 [not too far away from Intercourse]-website:
www.dutchlandquilts.com
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old country quilt store on rte 340- up the street from Zooks
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Quilt and Fabric shack