This is according to uae.gc.ca website (UAE office is responsible for Visitor Visa from Qatar)

** Canadian bank drafts may be obtained from major international banks.

** Canadian bank drafts are also available in major foreign exchange centres.

Link1:
http://www.canadainternational.gc.ca/uae-eau/visas/temporary_resident_te...

Link2: http://www.canadainternational.gc.ca/uae-eau/visas/fees-frais.aspx?lang=eng