As of 02/2016, auction prices are in the range of C$5 to C$6 for most uncirculated bills. Circulated ones will be worth much less, perhaps C$1.50 to C$2.50.
Exceptions
Certain replacement notes, similar to US "star" notes, are worth more depending on the special three-letter combination at the start of the serial number:
Assuming it's a coin the same size and brass color as a U.S. dollar, it's worth ... one dollar.
A dollar, this is the Canadian currency as well, a dollar.
It's still worth one dollar in Canada.
It's still worth one dollar in Canada.
As of 6 February 2016, it converts to $1.44 in U.S. dollars.
As of 6 February 2016, it converts to $1.44 in U.S. dollars.
one dollar is worth a little over a dollar in Canada
It's still worth a dollar.
$20
In circulated condition, it's still worth one dollar.
Its worth at least a dollar!
It is no longer in circulation so it'd be worth A twoonie (2 bucks) or variant on it's age, contact a currency buyer or collector to have it appraised. Check eBay also.