OCF that Bryan mentioned is around $80-90 for a case now (taxes incl.). There's a place in Waterloo that had better pricing.

Here in Detroit there's a motor/performance shop about 10 minutes from home that carries BP and it costs me about $70 USD (taxes incl.). Even if I could get it slightly cheaper if you factor the conversion rate, once you factor in time and convenience it comes out way ahead.

I run BP in my Talon, my Laser and my '69 Malibu.