and if not, what extension can I get to allow me to do them. My current shopping cart does this, but it's woefully outdated in other ways and I really need to switch to something more modern.
95% of my products ship in standard letter envelopes. I have three tiered flat rate shipping on them:
US orders - $1.00
Canada orders - $2.00
All other countries - $3.00
Even if I just used flat rate shipping, I don't see any way to configure it for these three scenarios.
And the remaining 5% of my products are items that ship by weight (Usually 8 oz or less, rarely over 2 lbs).
So in addition to the flat rate shipping for the 95% of my products, I need to have weight based shipping for the remaining 5%.
If I can't do this with ShopSite (with or without an external module), then I can't use ShopSite.