Mike, I am not sure what model the Instead e-cig is, but I can tell you that it is NOT Kr8 compatible.
If you look at the picture of the INSTEAD cartomizers, you'll notice that they have the male end. Which means they would want a battery such as the 510, with a female end. The Kr8 batteries have a male end, with the cartomizers having a female end.
Could be THIS model.....it's the only carto model outside of the ones we are more familiar with.
E Cig with Disposable Atomiser
Instead.ca do NOT sell any cartomizers that contain nicotine, so you are essentially just buying carts you'd need to boil out and refill. They are also ridiculously expensive! 4 dollars per cartomizer, plus taxes and 9 dollars shipping. Eat me.
Lastly, since these folks are based in both the US and Canada, I would be wary of where they actually ship from. I know very little about this company, and never hear it mentioned in ANY Canadian e-cig group or forum. They also do not participate in any Canadian discussion. That tells me that they could be a potential drop shipper from one standard location. I would contact them regarding shipping policies first. Better safe than sorry.
Alas, when it comes to pre-filled cartomizers we are at the mercy of the few US companies that do ship to us.
Vapor4Life
Nhaler
CigTechs
LeCig
VaporNine
IkenVape