Hard to find these not made in China anymore, but here are some good options:
Kitch Easy Release White Ice Cube Tray - Made in the USA out of top food grade materials
Sterilite Plastic Ice Cube Tray - Made in the USA. Strong and flexible.
Rubbermaid Easy Release Ice Cube Tray - The classic, made in the USA.
Arrow Mini Ice Cube Trays - Made in the USA. Perfect for water bottles.
The Best Products NOT Made in China | notochina.org
A community to find the best products still not made in China