At present the only way to pledge on Kickstarter is through http://Amazon.com. Plus it allows me to easily keep track of what rewards you will get and how close we are to our goal. Setting up an account is pretty easy, and should only take a minute or too. You can always cancel the acount, if you don't want another online thing to keep track of.
If you absolutely don't want to use Amazon, I won't insist. Just send me a message and I'll tell you where to send a check!