The dollar being at parity should help with the shipping cost - most canadian retailers are still charging 20-30% more than the us price for books at least.
I've never seen any Gamescience bronze or copper dice. I don't see them on their official website either. Do you have a link to them? All of the Gamescience dice I have are the unpainted gem dice.
One set would cost you $6 S/H which is about what you were saying you don't want to pay (cost is almost what the dice cost unless you bought a more expensive set). But I wasn't sure if my prices were cheaper than a Canadian store's prices would be. I thought it might make up for the shipping if mine were cheaper.
If you bought 2, 3, or even 10 sets of dice, the shipping would be $7 for it all.
My sets of dice are priced as if they were a single "huge" sized mini. I assume you wouldn't buy more than 10 sets of dice. But if you bought minis with the dice, it all figures in the same as if the set of dice were a huge sized mini.
Oh they are only in the 12 piece sets. Those and the glow in the dark dice are the only 12 piece sets I don't have in stock. But I believe I have all of the gem dice in stock (unpainted versions).