Here are a few sales that I have noticed from some of my favorite trekking poles manufacturers. If you know of any more please let me know so I can update.
Montem Outdoor Gear
DEAL: Free pocket blanket with any purchase of their products
Looks like they have some new trekking poles too:
Montem Ultra Strong EVA Handle Trekking Poles
Montem Ultra Strong Cork Handle Trekking Poles
Montem Ultra Strong Anti-Shock Cork Handle Trekking Poles
Montem Carbon Fiber Trekking Poles
Odyssey Outfitters
DEAL: Looks like their poles are on sale for $49.88
Odyssey Outfitters Carbon Fiber Trekking Poles
High Stream Gear
DEAL: Get 10% off when you purchase one of their qualifying items
High Stream Gear Folding Trekking Poles
Foxelli
DEAL: Purchase an 15 Foxelli producst and get 15% off entire order
Hiker Hunger
DEAL: Get 10% off their hammock with the purchase of any of their products
TrailBuddy
DEAL: Get 15% off when you purchase 4 Trailbuddy trekking poles of any color
