Profile Design
A thumbs-up for Profile Design: I have a half-dozen of their "Kage" bottle cages, the ones that use a rubber o-ring as part of their retention system.
On a couple of the older cages, the o-ring has finally broken. I e-mailed Profile last Wednesday, and they e-mailed me back later that same day and said they would send me some rings, and on Monday a small handful of them arrived here by mail. I was impressed!