Google Craigs List and Kijiji to get prices and then judge accordingly.
Beware of whom you let into your house. Better still have a friend with you or meet at a public place. I, personally have had no problem with any one.
A genuine buyer will ask for your S/N to check with Shaw (in case it was stolen). Just give the Number.
You don't need to delete your HD since it contains no personal information or illegal recordings, but if its no trouble do it.
Here are some prices on Craigs
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vancouver.en.craigslist. ··· &maxAsk=