Save meta value as an array of arrays

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If you don’t need to query on the data, you can pass arrays directly to the post meta functions, WordPress will automatically serialize/unserialize the data for you.

$your_array = array(
   array(
    'title' => 'something',
    'price' => 'something',
   ),
   array(
    'title' => 'something',
    'price' => 'something',
   ),
);

update_post_meta( $post_id, 'your_key', $your_array );