I've had a happy experience with "Outdoor Gear Canada", the distributor of the blinking lights I use for cycling. They've offered to send me a replacement clip for a favorite red light. I dropped the thing yesterday morning, and naturally it landed on the clip, knocking that piece. A light that I can't clip to my bike's of no value, but I noticed that the clip is replaceable, so I wrote to the distributor asking if they sold replacement parts. Instead of selling me one, they're willing to just send one.
(And thanks to little Emma for diligently picking up the tiny shards of black plastic after I dropped the light.)