Once PoS is implemented, it will no longer be possible to mine Ethereum using GPUs (mining will be replaced by "staking", which is based on how much Ethereum you hold, not how much work you do). It will essentially make all GPUs useless for Ethereum mining. I also live in Canada (in Toronto in Ontario) but I don't think it's as bad as you're making it out to be. Although there are a lot of things to complain about here (e.g., gas and electricity prices), PC parts is not one of them, and I regularly order things from Newegg.ca for a fair price. Frankly, when I hear about some of the prices in Europe, I feel somewhat thankful.