These are physical stores that sell jigsaw puzzles around the US. Many also sell jigsaws on their website.
California
Bird in Hand
Games of Berkeley
Gamescape North
Gepetto’s Toys
Puzzle Zoo
The Game Chest
Mountain Pastimes
Colorado
Connecticut
Amato’s Toy and Hobby Of Middletown
Time Machine Hobby
Toy Soldier Mystic
Delaware
Georgia
SqFt Decatur
Homegrown Decatur
Richards Variety Store
Illinois
Cat & Mouse
Oakridge Stores
Red Racoon Games
Indiana
Moonshot Games
Puzzles Plus Shipshewana
The Book Corner
The Puzzled Gamer
Kansas
Kentucky
Louisiana
Maine
Book Review Maine
Diversions Puzzles and Games
Island Treasure Toys
Nonesuch Books
Sherman’s Maine Coast Book Shops
Treehouse Toys
Massachusetts
Eureka Puzzles
Hobby Emporium
Maziply Toys
Puzzle Me This
Michigan
The Toy Shelf
Whistle Stop Hobby and Toy
Minnesota
Missouri
Dutch Country General Store
Puzzle Warehouse
Nevada
New Hampshire
Diversions Puzzles and Games
White Mountain
New Jersey
Navita’s Hallmark
Toys Express at Jersey Shore Premium Outlets
The Missing Piece Puzzle Company
New York
Hobby House Toys
Prestige Puzzles
North Carolina
Outer Banks Christmas
Tic Tac Toys
Dancing Bear Toys
Ohio
King Arthur Toys
Lehman’s
Puzzles Plus
Sweets & Geeks
Oregon
Pennsylvannia
Castle Toys and Games
Lucky Duck Toys
The Jigsaw Puzzle Shop
Tennessee
Texas
Go! Calendars Games & Toys
Otto’s Granary
Terra Toys
The Toy Maven
Utah
Game Night Games
The Red Balloon Toy Store
Teton Toys
The Tutoring Toy
Virginia
One Eyed Jacques
Pufferbellies
Puzzle Palooza Etc
Washington
The Best Puzzles & Gifts
Math ‘n’ Stuff
Snapdoodle Toys
Wisconsin
The Board Game Barrister
Games By James