We take a very simple approach to shipping costs, taking into account where you are at we charge based on the cumulative prices of the items in your cart at time of purchase.
We have six tiers:
Purchases USA Int'l
$0 - $9.99 $4.95 $6.95
$10 - $19.99 $5.95 $7.95
$20 - $29.95 $6.95 $9.95
$30 - $69.99 $8.95 . $10.95
$70 - $99.99 $9.95 . $12.95
Over $100 is always FREE :-D