These are physical stores that sell jigsaw puzzles around the US. Many also sell jigsaws on their website.
California
Games of Berkeley
Puzzle Zoo
The Game Chest
Mountain Pastimes
Colorado
Connecticut
Amato’s Toy and Hobby Of Middletown
Toy Soldier Mystic
Delaware
Georgia
SqFt Decatur
Homegrown Decatur
Richards Variety Store
Illinois
Indiana
Moonshot Games
Puzzles Plus Shipshewana
The Book Corner
Kansas
Louisiana
Maine
Book Review Maine
Diversions Puzzles and Games
Island Treasure Toys
Nonesuch Books
Sherman’s Maine Coast Book Shops
Treehouse Toys
Massachusetts
Minnesota
Missouri
Dutch Country General Store
Puzzle Warehouse
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
Pennsylvannia
Tennessee
Texas
Utah
The Red Balloon Toy Store
Teton Toys