I think you will get a discount between 2% and 5%, depending on demand and inventory. Really depends how hungry the dealer is. Don't be surprised if they just don't want to deal at all, due to the reasons quoted above. On the other hand, there are far fewer stories here about dealers who have no interest in aftersales service.

Also, I don't think it is quite right to say 17% luxury tax, it is provincial tax (PST), plus federal tax (GST) plus luxury tax that adds up to that hit.

Good luck!

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue