If you're looking for K&N, then you can try the above.
For AFE, it's pretty difficult to find anything in the GTA. I bought an AFE filter + oil online from www.lowriders.ca
in BC. They have competitive pricing compared to US retailers, however they have a somewhat hefty charge for UPS shipping (but no brokerage fees since it's CDN). Taking into consideration duties, brokerage fees, and currency exchange and the risk of having a shipment being rejected (due to importing potentially flammable liquids), LowRiders comes out ahead compared to US retailers if you're in the market for filter+oil+cleaner; hard to get around the shipping cost though if you're just looking for cleaner