There’s the Citizen Gotham 1 for $299 that you can mail order, which weighs in at 26 pounds. Though colorful, if you have any issues with the bike, there’s no local dealer to take it to.
Then there’s the Tern Link Uno, offered through Tern dealers nationwide, who assemble and test before handing the bike over to you. For any warranty issues, you’d just bring the bike back to your local Tern dealer. The Uno weighs 25.3 pounds, comes with front and rear fenders, rear coaster brakes and offered for $400. It offers a firm, secure ride.
Optionally, I’d have you consider the Dahon Boardwalk S1, also sold & supported via a dealer network, which weighs 27.6 pounds. Front and rear fenders, rear rack, rear, rear coaster brakes, front pull brakes & kickstand are standard. All for $299.
Or the Origin8 F1 Select. Also single speed, it’s the lightest at 24 pounds and priced at $359. Rear coaster brakes are standard.