This is a little theoretical - I don't stockpile anything but silver quarters but here goes:
1. Pure Ni quarters to 1999 were worth well over face in the big nickel run up several years back. I fully expect melt to exceed face value in time again.
2. One Canadian dollar buys about 1.01 USD today, hence my cute remark. While this is not enough to justify sorting out Canadian coins just yet, i can tell you that pulling American coins from circulation in Canada and repatriating them was a reasonably profitable hobby even at a 10 percent spread, even better at a 30%+ spread. Using those US coins obtained at a discount to buy silver made for a nice effective discount on silver. The CDN$ (and most other currencies) are strong again the greenback.
http://www.xe.com/currencycharts/?from=CAD&to=USD3. Some members have access to discounted Canadian coins. They sell them on and make a nice profit.
4. While US banks will not exchange Cdn coin rolls, there are a number of ways to exchange them. AGgressive Metal buys them and resells them. You can sell them on ebay as Cdn cash and get near full value less fees. For members interested, I will exchange Canadian coins that are shipped to my US address for a 10% discount. In other words send me CAD$100 and I'll send you $90 US. This rate holds as long as the dollars stay near parity.