Valpak 1 code works OK for me.
But yes, limit of three.

Well, it took the code..
You have attached the following coupon to your profile: Valpak 1. Your coupon will apply automatically if the following applies to your order: Get free letter mail shipping when you quote promo code
but is still trying to charge CAD 12.99 for shipping....
I give up... too much work.

However, check out this:
a TEN KILOGRAM 99.999 Gold Coin face value of CAD 100K.
I figure it is about $550K worth of Gold,
but I don't see a price or option to add it to cart ...

http://www.mint.ca/store/mint/learn/...o-coin-6500002