A large portion of that $45 goes to the "Free Worldwide Shipping". We're looking at offering multiples in a package but it's a grey area on Kickstarter: >Offer

A large portion of that $45 goes to the "Free Worldwide Shipping". We're looking at offering multiples in a package but it's a grey area on Kickstarter: >Offering multiple quantities of a reward is prohibited. Hardware and Product Design projects can only offer rewards in single quantities or a sensible set (some items only make sense as a pair or as a kit of several items, for instance). The development of new products can be especially complex for creators and offering multiple quantities feels premature, and can imply that products are shrink-wrapped and ready to ship. We might be considered a sensible set, or we might not. We're reaching out to Kickstarter now.