Pledge for the closest reward that you want, then edit your pledge amount by the multiple that you'd like. You'll have the opportunity to "spend" that pledge amount as credit in the post-campaign fulfillment survey.
For example, if you want three of the patch 3-packs, just choose one as your reward, then multiply the pledge amount by 3 times.
You will only be charged shipping costs once.
If you want combos of items not offered as rewards (such as 10x a single patch design, or 2x a button set), again just calculate the estimated total amount and edit your pledge to cover that cost.
If anything is off, you'll have a chance to revise it as part of the backer fulfillment survey after the campaign closes. That said, pledging while the campaign is live helps us reach the core funding goal and unlock stretch goals.