Be prepared to pay $50 to $80 for it if you wait it out you'll get a better deal. The no1 mag.
I guess it depends on what you call a better deal and if the wait is worth it.
Marstar has very good, original No1 mags for $60 plus taxes and shipping.
If the poster wants to shoot the rifle soon, rather than hope a cheaper mag shows up, which is likely at some gun shows but only saves the tax/shipping, then Marstar would be a good place, in Canada to purchase such a mag.
At the last show I was at, if you could pick up a decent No1 mag for $75 you were doing well. Some guys were purchasing beater sporters for their mags.