There have been a few posts from folks who got used carbon shaft golf clubs dirt cheap and used them; but never understood how they could be long enough.
If you don't mind the poles bowing under tension, then the ones under 1/2" diameter should be fine.
If you do mind, and want something stiff like trekking poles, you need thicker ones. If you want them already manufactured, look for a sale on avalanche rescue probes, or possibly used/damaged ones. If you can make them, buy some carbon tubing over 1/2" diameter from a kite materials company like Goodwinds. If you want them to fold up, you'll need ferrules, so you'll need to find carbon tubing that will telescope snugly into the larger tubing. The kite companies obligingly provide both inner and outer diameters. There are lots of ways to anchor the shock cord.
Quest also sells the larger diameter Easton alloy poles, with ferrules, which would be stiffer also; but you may find them too heavy.