The trekking poles that are sold at the Portal store are quite nice for the price. Last year, they were around $45.00 a pair, and they had some with or without the spring mechanism. A couple of people in my group bought a pair, and were thankful of them, especially coming down the switchbacks. Not as pricy as the Leki models, of which is what I use, but far superior than any $10.00 poles from Walmart. Just my opinion.
Michael T.