I use Black Diamond trekking poles. Mine were 159.99 got them on sale for 85 @ Campmor. I'll give you a little insight onto their effectiveness....
In idaho last year, I was the heaviest member of our group of 4. 6'4 285lbs without my 20lb pack on. One of my buddies who lives in Spokane, is an avid backpacker and is in great shape year round is very quick up the mountain. He's 5'9 175 lbs ish. We gave him the nickname billygoat because he would fly up the mountain without poles. I tried to stay with him without my poles the first day and almost died. I'm not in bad shape either. The next day I busted out my poles, and I was on his heels the whole way. The poles are an advantage because they allow you to take weight off your legs while climbing and transfer it to your upper body. I have a strong upper body so the effect was amplified. I bet you'll never see a 300+lb guy going up a mountain as fast as I could go up a mountain with poles. They literally turned me into a machine, no leg fatigue, climbing steep was easy and I didn't have to go hands and knees. Trekking poles also help you when you're packing out heavy loads. If I would've had an elk quarter in my pack, I would be 400lbs on the boot easy, and I feel like I could've gone all day. Try them out, once you get them figured out you'll fall in love. Shorten the poles for climbing, lengthen the poles for descending. Pretty simple and when you get in sync with them you'll feel beast mode coming out.