Yeah.Wait what? Trading in your PS4 at EBGames gives you the sales tax on it as well?
So basically, if you're trading in towards Pro, the Pro will cost you (500-210)+tax. Rather than (500+tax) - 210.
This is actually the reason I didn't bother to sell my xbox one on kijiji when I wanted to buy the S. The price ebgames was offering was netting me more thanks to the tax savings than what the console was going for on kijiji and ebay at the time.