For mailing, you can get paper or lightweight cardstock CD envelopes that might be worth taking a look at. There are a few different styles available with slightly different benefits and shortcomings.

If you want to ship a bulk package with everything in it, it would probably be worthwhile to get a rate comparison from one of the (International) package shippers like FedEx or UPS.

The US postal service has some "special rates" here - one size for one fee for anything that will fit in the box sort of things - that sometimes accomodate some sizes/weights at less cost than more "content specific" packaging, but I don't kow how they're applied for international shipments.

John