Not sure about other Home Depot's but the one on Cyrville Rd, in the east end, has timers on clearance sale. This one here, which I can't find on the Cdn site, for example normally costs $30 Cdn and they have it for $8. All the timers are on a table in the lighting section.
https://www.homedepot.com/p/Defiant-Indoor-7-Day-SunSmart-Digital-Timer-15079/100685884
I picked up the one mentioned above at Home Depot in Barrhaven last week.
Easy to set up and works great.