I got mine from another collector last year in exchange for around $600. But the price is now $1000 or more. Wait a while, and it will only go higher.
They were only $750 a few months back from IMA, but since their stock is running out, their price gets adjusted.
Also, just because it is excluded from the mag capacity regulations in the criminal code, does not mean it will not be subject to the DFAIT rules as controlled goods. It is exclusively for a prohibited automatic firearm.
I have seen the complete boxed sets of 4 from time to time on milweb.org, but usually around 1500 pounds. By the time you import it, you won't save much over those $1000 ones.