Feed Tool add-ons can be purchased independently from other plans. The only add-on which requires a quantity is for Multi-Country Feeds.
Clicking one or multiple add-ons will update your cart for checkout. For Additional country feeds, you will be required to enter a quantity as each feed is charged separately per month.
To complete your purchase, click Checkout and enter your payment details. Any added features will be found in the Feed Tool upon completion.
Note that some feed tool add-ons are included in higher tier Full Access Plans. The billing portal will automatically recognize these plans and will adjust your checkout accordingly.