TMF Hills Science Diet Weight Loss System Kit to $60

This coming Sunday, there will be a mail-in rebate form in the SmartSource for try-me-free on Hill's Science Diet Weight Loss System Starter Kit up to $60! You need to purchase it 7/11/11 - 9/30/11. Send dated cash tape with price circled, UPC, and form. Here's the interesting part:
Limit one offer per rebate form. Really?

Note: It doesn't start until 7/11, so don't purchase it until then.