A subscription product can’t be mixed with a one-time payment product. Those need to be two separate products handled using two separate checkouts.
You can potentially use the “Setup Fee” feature of the subscription plan to charge a one-time fee for it. So you can make two subscription plans and offer the customers a choice like the following:
1) The standard subscription plan for the main item.
2) Another subscription plan for the main item with a “Setup Fee” of $10 for the 10 rolls.
3) Create two products for these two plans, then put both of those products on the landing page.
4) The customers can select the one they want.