In MarketPress, I want to have a product without shipping

We are using MarketPress for eCommerce and have a couple of products for purchase and use a Table Rate for shipping. All is well there (although our shipping dude would like invoices, but that's a different topic).

I would like to have a product that does not require shipping. Basically, it's a sponsorship for our radio show. They contribute money to help us stay on the air and we give them a big 'ol hearty THANK YOU on the air.

As such, there's no shipping. But I can't find a way to suppress the shipping cost per item. I can turn off the tax (we'll pay it ourselves without adding it into the displayed cost), but not the shipping.

Any help or clever work arounds you can provide would be greatly appreciated.

Bob
bobrodd (at) gmail.com