Don't allow checkout to proceed for items with price of 0

We have products that require a quotation, so we use the price of 0 and I created a theme template called product-quote so that they cannot add to cart only ask for a quote via contact form

But there are some people who have already added products in the cart with price of 0

We want to make sure if a product with price of 0 got to the cart for some reason, they will be unable to check out.

maybe 2-3 ways

  1. if there is products in the cart with price of 0 delete them

  2. if there are products in cart with price of 0 don’t let them check out

  3. alternatively if only products with price of zero in the cart

thanks in advance

@starpaint

Hi , kindly provide your store URL please and if it is password protected, please share the password as well. Thanks

How can i securely ?

We have fixed this with Shopify Support but adding another product template and contact and clearing all carts