Double, I tell ALL my customers that pay broker tags that when they have stuff shipped to them, try to get the shipper to just put down a value of $15.
Everything that has a value over $20 CDN is subject to the taxes, (maybe duty) and broker fees. Especially if they're receving stuff from family or friends. A little harder to try and convince a big shipper to do that.
I order stuff from ebay all the time, and before I even bid on anything, I make sure they can put down a lower declared value for me. If not, I'll go look elsewhere. Works all the time.