Henry Repeating Arms
Sent an email asking if they had recommendations for fine tuning and smoothing the trigger. My email was immediately answered by the owner/president of the company. He said they'd be happy to do the work for me. An entirely new beautifully done trigger and hammer arrived in about three days. No cost. The original trigger was not bad, it could have just used a little improvement which I was more than willing to do myself. The new one they sent is smooth and crisp like a target trigger.
Kel-Tec CNC Industries
I called and asked if I could buy a spare magazine follower, they mailed three to me immediately, for free.
The Sportsman's Guide
I received a riflescope with a damaged lenscap. They sent me an entire new scope immediately and a prepaid shipping label to return the old one. I had the new one in my possession so quickly that I hadn't even had a chance to send the old one back yet. (Not to mention that the scope was typically $100 at other online merchants, and Sportsman's Guide had it for $29!)