Like Dennis, I make my own from tubing, though for the ring at the end I bend a piece of D-shaped wire back on itself to make a ring and a shaft that fits tightly into one end of the tube, the chain also a tight fit in the other end - see photo. (Before soldering the one on the left in the photo, I'd push it right in so the shaft is inside and the ring is flush with the end of the tube. The one on the right has been soldered, but still needs some finishing.) If you start with the chain fitting tightly inside the tube and make sure the surfaces to join are clean, very little solder should be necessary, so not much risk of excess running along the chain and bonding the links solid. I put a small pallion of solder inside the tube at the cut end of the chain, then heat and feed a little more solder into the end where the shaft/ring part is sticking out. Once it's all fixed, I file away excess metal from the ring end and squidge it a bit to shape it the way I want it. The photo shows 3mm chain, designed to take big-hole beads - end cap needs to be not much wider than the chain itself, so it fits through the bead holes. I start with larger diameter tube and draw it down to exactly the size I want, so the same principle works with thinner chain, though it may be more fiddly.
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