Wooden frames A3 and A4 size (Meppershall SG17)

I am looking for 2 wooden or wood effect frames with or without mount.
Exact sizes: 10”x12” = 25.5cm x 30.5cm. And
11.5” x 16.5” = 29.5 cm x 42cm.
It’s hard to find these sizes in shops with wooden effect frames
Many thanks