Canada Post will be increase the postal rates by 5.4% on January 11, 2009. Time to stock up on those permanent stamps while they still cost 54 cents. Cost Co sells rolls of 100 Permanent stamps for $52.50 The new rates will be:

Canada Post Rate Increases

Postal Class / Service	Weight Break	2009 Rates	Jan 11th 2010 Rates
Domestic Lettermail - Standard	0g - 30g	$0.54	$0.57
	30g - 50g	$0.98	$1.00
Domestic Lettermail - Other	0g - 100g	$1.18	$1.22
	100g - 200g	$1.96	$2.00
	200g - 300g	n/a	$2.75
	300g - 400g*	n/a	$3.00
	400g - 500g*	n/a	$3.25

Once the price of the permanent stamp increase to 57 cents you should still be able use multiple P stamps at the new rate. For example you can use 5 P Stamps plus 40 cents of regular stamps to send a 400-500g package. Which would be a 4.6% savings.