if and that is a BIG if , you find a mag , your looking at a couple hundred dollars . anyone who has one can pretty much set whatever price they want .
I've seen a few hakim mags for sale in the states .
mg13 mags are supposed to work too , but I have never found anyone in the states willing to pin one and ship it to Canada .
if your handy with tools , a guy could take a 308 based mag ( ie m14) and cut and section it to make it function with the longer rounds .