http://www.aquariumplants.com/product_p/t.htm
Item# Item Name Our Price Qty Add
T2.5E Aluminum Co2 Cylinders(new)(2.5 lbs empty) CAD56.49
T10E Aluminum Co2 Cylinders (new)(10 lbs)(empty) CAD79.09
T10F Aluminum Co2 Cylinders (new)(10 lbs)(full) CAD112.99
T2.5F Aluminum Co2 Cylinders (new)(2.5 lbs)(full) CAD90.39
T20E Aluminum Co2 Cylinders (new)(20 lbs)(empty) CAD101.69
T20F Aluminum Co2 Cylinders (new)(20 lbs)(full) CAD141.24
T5E Aluminum Co2 Cylinders (new)(5 lbs)(empty) CAD56.49
T5F Aluminum Co2 Cylinders (new)(5 lbs)(full) CAD90.39
T50E Aluminum Co2 Cylinders (new)(50 lbs)(empty) CAD271
These prices seem pretty good and they ship to Canada $35.90 delivery
...................Dave