Is it possible to get the label of a theme customizer option?

If the customizer has been bootstrapped (that is, if the customize_register action has fired), then you can look at the control itself (assuming you flip your choices array, as I think your values should be the keys and vice-versa):

$price = $wp_customize->get_setting( 'price1' )->value();
$control = $wp_customize->get_control( 'price1' );
$price_text = $control->choices[ $price ];

However, you probably want to obtain the chosen price’s text outside even when the customizer isn’t bootstrapped. In that case, you should store the choices array separately and then pass it in as the choices param but then also reuse it elsewhere. For example:

$wpse_250302_default_price_choice="95";
$wpse_250302_price_choices = array(
    '95' => 'regular price',
    '65' => 'special price',
    '35' => 'other price',
);

add_action( 'customize_register', function( WP_Customize_Manager $wp_customize ) {
    global $wpse_250302_default_price_choice, $wpse_250302_price_choices;

    $wp_customize->add_setting( 'price1', array(
        'default' => $wpse_250302_default_price_choice,
    ) );

    $wp_customize->add_control( 'price1', array(
        'label' => 'price 1',
        'settings' => 'price1',
        'section' => 'pricessection',
        'type' => 'select',
        'choices' => $wpse_250302_price_choices,
    ) );
} );

add_action( 'wpse_250302_some_theme_action', function() {
    global $wpse_250302_default_price_choice, $wpse_250302_price_choices;
    $price_value = get_theme_mod( 'price1', $wpse_250302_default_price_choice );
    $price_text = $wpse_250302_price_choices[ $price_value ];
    printf( "<h4>%s: %s</h4>", esc_html( $price_text ), esc_html( $price_value ) );
} );