There's actually a lot of quality Canadian online retailers (plus plenty that deliver to Canada). I don't remember them all off the top of my head, but Newegg has a canadian branch and I
think Sidewinder might be Canadian...I think Performance-PCs might be too...not sure about that though..
How much is "too much"? $100? $50? A quality case can run you everywhere from $40 to $400+ depending on what you want. For the moment, I'll assume under $100.
Let's see, black, sleek, and cheap...hmm. There's the
Cooler Master HAF 912 or
CM690II, the Antec
300 or
600, or the NZXT
Gamma,
Guardian 921, or
Tempest Evo.
Any of those in the right direction?