Your best bet would be to order one from the states. The stuff that russels or wholesale sports or other canadian retailers (as far as I know anyway) are way to expensiver. With the exchange rate beeing so good right now as well you will be able to get a good deal on a VQ, skeeter (this is what I have in my 10/22 and I really like it), or another hammber.
If your machining skills are any good you could also modify your factory hammer by just cutting some of the metal away where the "hook" is in the hammer and changing the angle by a couple degrees. If you mess up you could just order another. I have done this and got my trigger down to 2lbs or so. I also polished the seer, dissconector and hammer.