It is an unlimited use coupon for three days. I have no idea if the ca in nov5ca20 means it is Canada only.
Quote:
* Offer valid from Nov 5th at 12:00 AM (EST) through to Nov 8th at 11:59 PM (EST). This offer is not valid in conjunction with any other offer or promotion and cannot be used to adjust amount paid on previous purchases. Discount code is valid for 20% off any eBook purchase excluding eBooks from Hachette, Grand Central, Warner, and Little Brown. We reserve the right to change or end this offer at any time without notice.
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