I bought panettone from No Frills for $3. Not bad. Dry. Panettone tastes like egg bread with raisins & orange bits. It's also available in chocolate, lemon and other flavors.
Yesterday, I bought Milano's panettone (red bag) from Loblaws for about $4. I don't recommend it.
Even if a panettone costs over $10, it might not taste that good.
The best panettone I bought was from an Italian bakery (at McCowan & Sheppard). It was imported from Italy and it cost $5 (2 years ago). I dunno if they are currently selling the same brand.
If you are stuck with dry Panettone, just cut it into slices and dip into a french toast mix (eggs, sugar and a bit of milk) and fry. French toast panettone tastes better than using regular bread.
If you know where to buy good Panettone, please share. Thanks.