Answer:

according to this article
http://www.sacbee.com/content/women/story/14281707p-15089794c.html
"Tummy Tuck Jeans come in various washes and colors, and some feature fancy touches such as tuxedo stripes. Sizes range from plus to misses to petite, even petite-plus sizes.
A cute touch from Rudes-Sandel is the disclaimer attached inside each
pair: "NYDJ" (Not Your Daughter's Jeans).
The Tummy Tuck brand is carried at Nordstrom, select Macy's stores and specialty boutiques. They range in price from $88 to $128. If that
sounds pricey, you'll have to ask yourself how much you're willing to
pay for one pair of jeans that actually fit. There's also a Web site:
www.tummytuckjeans.com."

I checked for Nordstrom entering your zip code and I got

Nordstrom Rack the Overlook at King of Prussia (#634)
310 Goddard Boulevard
King of Prussia, PA 19406
(610) 205-8717
Nordstrom at The Plaza at King of Prussia (#629)
190 North Gulph Road
King of Prussia, PA 19406
(610) 265-6111

Macy's Locations (but you will probably have to call and check because
only selected Macy's carry them

Macy's Hamilton
4401 Black Horse Pike
Hamilton Mall
Mays Landing, NJ 08330
609/646-4900
Strawbridge's Dover Mall
2000 Dover Mall
Dover, DE 19901
302-736-0974
Macy's Deptford
1750 Almonessen Road
Almonsesson & Clements Bridge.
Deptford, NJ 8096
856/848-3300
Strawbridge's Echelon Mall
6003 Echelon Mall
Vorhees, NJ 8043
856-772-1800
Macy's Cherry Hill Furniture Gallery
498 Route 38 West
Maple Shade, NJ 8052
856/667-6495
Strawbridge's Moorestown
400 West Rt. 38
Moorestown, NJ 8057
856-642-6442
Macy's Cherry Hill
2000 Rt. 38; Suite 200
Cherry Hill Mall
Cherry Hill, NJ 8002
856/665-5000
Macy's Christiana
Christiana-Stanton Road
Christiana Mall
Newark, DE 19702
302/366-5800

And of course you can always order them on line