Below is a list of heirloom shops around the country. I am not affiliated with any of them. I do recommend you contact shops before travelling to check on hours of operation.
PLEASE leave other shops in the comments section and I will update the list! Thanks!
ETA: thanks for adding shops! Let's give travellers a place to stop in every State!
Alabama: Peanut Butter & Jelly Kids, Mobile. The Smocking Bird, Homewood.
Arizona: The West, Tucson for hand embroidery supplies.
Arkansas: The Stitchin' Post, Little Rock.
California: Yesterday's Dreams, Signal Hill.
Connecticut: Timelss Treasure by Maureen, Branford CT
Georgia: Branum's sewing and Vac, Washington Road, Augusta, Georgia
Indiana: Erica's, South Bend, hand embroidery supplies. Yoder's Dept. Store, Shipshewana, batistes & laces.
Louisiana: Allbrands & is located at4027 Veterans Memorial Blvd. in Metairie, LA 70002, Heirloom Creations on Rena Dr, It's Sew Heavenly on Twin Lakes Blvd off Verot School. Lola Pink Fabrics on Arnold Blvd off Johnston.
Maryland: Tommorrow's Treasures, Crofton.
Mississippi: Continental Fabrics, Jackson. Sewing Boutique, Vicksburg. Stitch N Frame, Bovina. Heirlooms Forever, Tupelo.
North Carolina: Elegant Stitches, Cary.
Ohio: Martha's Heirlooms, Mason. Sweet Stitches, Columbus.
South Carolina: Farm House Fabrics, Beech Island.
Tennessee: The Children's Corner Store, Nashville. The Lace Cottage, Germantown. (I wonder if this is near The Man's apartment?) A Frayed Knot, Lakeland. Gina's Bernina, Knoxville (Farragut).
Texas: Buttons & Bows, Houston.
Virginia: Chadwick Heirlooms, Richmond. In Stitches, Alexandria (not smocking but great thread collection).