Click on Update #14 to see the prices and items available. You can adjust your current pledge while the Kickstarter is running or add items after the close (up to a week or so after May 4th) and be billed the additional amount via Paypal.
When backer surveys go out, there will be a field to list the items you've added/want to add.
Or you can send me a note here in Kickstarter with the items.
All items will ship with the rewards package in Fall.