diff --git a/includes/class-modal-checkout.php b/includes/class-modal-checkout.php
index 4cfd68146..1acb95aed 100644
--- a/includes/class-modal-checkout.php
+++ b/includes/class-modal-checkout.php
@@ -100,6 +100,10 @@ public static function init() {
 		add_filter( 'jetpack_active_modules', [ __CLASS__, 'jetpack_active_modules' ] );
 		add_filter( 'woocommerce_checkout_update_order_review_expired', [ __CLASS__, 'is_not_modal_checkout_filter' ] );
 
+		// Make the current cart price available to the JavaScript.
+		add_action( 'wp_ajax_get_cart_total', [ __CLASS__, 'get_cart_total_js' ] );
+		add_action( 'wp_ajax_nopriv_get_cart_total', [ __CLASS__, 'get_cart_total_js' ] );
+
 		/**
 		 * Ensure that options to limit the number of subscriptions per product are respected.
 		 * Note: This is normally called only for regular checkout pages and REST API requests,
@@ -591,6 +595,7 @@ public static function enqueue_scripts() {
 					'billing_details'  => self::get_modal_checkout_labels( 'billing_details' ),
 					'shipping_details' => self::get_modal_checkout_labels( 'shipping_details' ),
 					'gift_recipient'   => self::get_modal_checkout_labels( 'gift_recipient' ),
+					'complete_button'  => self::order_button_text_with_price(),
 				],
 			]
 		);
@@ -1173,16 +1178,45 @@ public static function order_button_text( $text ) {
 		if ( ! $cart || $cart->is_empty() ) {
 			return $text;
 		}
+
+		return self::get_modal_checkout_labels( 'checkout_confirm' );
+	}
+
+	/**
+	 * Get the updated "Place order" button text for JS updates.
+	 */
+	public static function order_button_text_with_price() {
+		$cart = \WC()->cart;
+		$is_donation = method_exists( 'Newspack\Donations', 'is_donation_cart' ) && \Newspack\Donations::is_donation_cart();
+
+		// If this isn't a cart, if the cart is empty, or if this is a donation product, bail.
+		if ( ! $cart || $cart->is_empty() || $is_donation ) {
+			return;
+		}
+
 		$total = \wp_strip_all_tags( \wc_price( $cart->total ) );
 
 		return sprintf(
 			/* translators: 1: Checkout button confirmation text. 2: Order total. */
 			__( '%1$s: %2$s', 'newspack-blocks' ),
 			self::get_modal_checkout_labels( 'checkout_confirm' ),
-			$total
+			'<span class="cart-price">' . html_entity_decode( $total ) . '</span>'
 		);
 	}
 
+	/**
+	 * Get the updated price for updating the "Place order" button.
+	 */
+	public static function get_cart_total_js() {
+		$cart = \WC()->cart;
+		if ( ! $cart || $cart->is_empty() ) {
+			return;
+		}
+		$total = \wp_strip_all_tags( \wc_price( $cart->total ) );
+		echo esc_html( html_entity_decode( $total ) );
+		wp_die();
+	}
+
 	/**
 	 * Render before the checkout form.
 	 *
diff --git a/src/modal-checkout/index.js b/src/modal-checkout/index.js
index 008a5c3a8..7b9627e27 100644
--- a/src/modal-checkout/index.js
+++ b/src/modal-checkout/index.js
@@ -128,6 +128,48 @@ domReady(
 					$( '.payment_methods' ).after( $el );
 				} );
 
+				/**
+				 * Get updated cart total to update the "Place Order" button.
+				 */
+				function getUpdatedCartTotal() {
+					let cartTotal;
+					$.ajax({
+						url: newspackBlocksModalCheckout.ajax_url,
+						method: 'POST',
+						async: false,
+						data: {
+							action: 'get_cart_total',
+						},
+						success: (response)=>{
+							cartTotal = response;
+						}
+					});
+					if ( cartTotal ) {
+						return cartTotal;
+					}
+				}
+
+				$( document ).on( 'updated_checkout', function() {
+					// Update "Place Order" button to include current price.
+					let processOrderText = newspackBlocksModalCheckout.labels.complete_button;
+					if ( ! processOrderText ) {
+						return;
+					}
+					if ( $( '#place_order' ).hasClass( 'button-label-updated' ) ) {
+						// Modify button text to include updated price.
+						const tree = $( '<div>' + processOrderText + '</div>' );
+						// Update the HTML in the .cart-price span with the new price, and return.
+						tree.find('.cart-price').html( getUpdatedCartTotal, function() {
+							return this.childNodes;
+						} );
+						processOrderText = tree.html();
+						$( '#place_order' ).html( processOrderText );
+					} else {
+						// Set default button label passed from PHP.
+						$( '#place_order' ).addClass( 'button-label-updated' ).html( processOrderText );
+					}
+				} );
+
 				/**
 				 * Handle gift options.
 				 */