Does anybody know where I can find an shipping or total order module for optional USPS insurance. I found one for UPS, but it only allows fixed increments, and the USPS fee schedule for insurance is really off ($1.30 for the first 50 dollars, $2.20 for the next 50, than it goes up a dollar for each 100 dollars after that). It doesn't quite fit with a scheme of picking an incremental amount for each 100 dollars, which is what is only allowed in the module that I found.

Would really appreciate any help.

Thanks