BigCommerce supports a feature called 'Product Availability' which allows you to replace the add to cart button with a pre-order button and also to hide certain product prices: Please refer to this guide.
Klevu also supports these features however they must be enabled by our support team for your store. Klevu also indexes Bulk Pricing data for your products, which must be enabled in the same manner. Please send an email to support@klevu.com by clicking on the appropriate link within the Klevu App via the 'Integrate Search' button, which will create an email containing the relevant information for your store: