Keeping in mind the OP and the budget of $300,
the list so far:

Dahon Boardwalk S1
Dahon Eco 3 (only under $300 when on sale)
Dahon Licensed Technology Boardwalk
Downtube Nuvo
E-Z Pack 1 Spd
Citizen Miami
Citizen Gotham (=Metrobike)
Citizen Tokyo
Citizen St. Tropez
Kent Compact Nexus 3
Kent Compact/16
Qile Duo 5 Speed 20
Schwinn Hinge
Schwinn Loop
SRS 6 Speed/20
TEK 101
TEK 201 24 Speed/20
Worksman FMB