If you need to mail anything to outside the USA you might want to check the PirateShip.com website. They offer the cheapest shipping costs via the USPS without any monthly membership/subscription costs like Stamps.com. They now have a new SIMPLE EXPORT RATE for shipping small packages that weigh less than 4 pounds to Canada or anywhere else in the world.

Here's some comparison prices for shipments to Canada using PirateShip vs retail rates at the Post Office:

0-8 ounces = $ 7.95 vs $10.50 at the counter
8-16 ounces = $ 9.95 vs $17.25 at the counter
1-2 pounds = $12.95 vs $17.25 at the counter
2-3 pounds = $16.95 vs $26.25 at the counter
3-4 pounds = $23.95 vs $39.00 at the counter

And here's comparison prices for shipments to France which I would assume should give a decent example for most foreign packages:

0-8 ounces = $ 9.95 vs $14.25 at the counter
9-16 ounces = $15.95 vs $24.00 at the counter
1-2 pounds = $17.95 vs $24.00 at the counter
2-3 pounds = $23.95 vs $37.50 at the counter
3-4 pounds = $35.95 vs $61.00 at the counter

Shipments are supposed to be delivered in 1-3 weeks with tracking included.