According to the Instruction Manual from
Canon USA the CA-570 Power Supply:
Rated output / consumption 8.4 V DC, 1.5 A / 29 VA (100 V) – 39 VA (240 V)
Which is a little odd. Most consumer power supplies use a motorola type plug with positive on the center pin. The issue is that the outside diameter and diameter of the inside pin can vary.
I normally like to buy genuine OEM parts but in this case the price is exorbitant.
There are, however, lots of places that take the worry out of finding a replacement unit. A quick search at my favorite Canadian on-line retailer found
this one for less than a third of the cost from approved Canon Canadian Retailers.
Googling "canon ca-570 replacement" will find similar results but you might want to ask about the retailer before purchasing .
If you really want the genuine replacement part buying Canon Accesories from US bricks & mortar retailers are 33 - 50% less than Canadian retailers.
B&H Photo Video, for example sells for 2/3 of the Canadian cost as does
Adorama, the other 800-lb gorilla. These discrepancies are interesting seeing that Canon Canada is a wholly owned subsidiary of Canon USA.
Of course buying from the USA you have to pay for shipping via courier who will really nail you for Customs brokerage fees if you don't do the research up-front.