The discount package insurance you purchase through Teapplix will be cheaper starting October 1st, 2011. For international USPS shipments, rates for insurance will be $0.89 per $100, no matter what mail class.
The limit is $5000 for Priority Mail / Express Mail International and $1000 for First Class International.
Domestic rates for USPS will remain $0.69 per $100 whether you have delivery confirmation or not.
The limit is $5000 if you have tracking, $1000 if you don't.
Rates for UPS / FedEx shipments will remain at $0.40 per 100 for domestic and $0.50 per $100 for international.
Remember you can put in automatic rules to add insurance, with separate rules for domestic vs international, under "Setup" => "Insurance". Often times, rates are cheaper than adding signature requirements, while still have your package protected for loss or damage.