Not a believer in "Loud pipes save lives", eh? I would say I encounter painfully loud noises once every week or two. Sometimes it'seems the sources you mentioned, but as often it's something I'm doing with tools.
Can't say I encounter painful noise ever. For sure if I go to a country show I can appreciate the chainsaws are loud, I ride a bike without ear defenders but it's not overly loud, I go a watch motorsports and can appreciate it's loud, but it's a good loud. My commuting mileage is 25k a year, 50/50 window down, no problems. Some my say my hearing is shot if I don't think anything is loud, but I can hear CFL's, mobile phone chargers, and my daughters swatch watch ticking in the next room drives me potty
The only time I encounter painful levels of sounds is when motorcycling, and for that I wear hearing protection (in-ear passive 20dB attenuators).
Working from home, the only painful noise levels I'm exposed to are when the babby is crying. Hobby-wise, the indoor rifle range I visit will be by far the loudest (although it's all .22LR stuff, so not *that* loud), and I wear ear defenders when I'm there.
The key there is "Sold by Savage Island:" what you're looking at is a listing on the Amazon Marketplace by a third-party seller, which is a UK company that has opted for its own reasons not to offer international shipping. You'll see plenty of that in reverse, browsing Amazon.com from the UK. Nothing to do with the product - it's not export-sanctioned or anything strange like that, and you can buy 'em in the US - just the seller.
I can sympathise on the loud noise front in my youth I was very much into loud car stereos, my own was 130Db which is the same as a 747 at take off from 100ft, means I have two tone tinnitus, loss of hearing in one ear loss of tone range and a dislike for loud noises. Day to day noise in the office, loudest thing is the weekly fire alarm test which is 80-90db or the hand dryers which are around 60. Then noisy man opposite me around the same. Workshop is light hand tools so 30-40db Car is tricky I think if you have had a perforated ear drum youll notice more the wind buffeting on your ear than the actual noise, windows down that is, up is obviously less an you can use aircon if its too warm. Noise wise though 40-60 depending on the speed an if the radio is actually on. Just a thought have you tried low level white noise to "de sensitise" your ears? I know it works on tinnitus doesn't even need to be on at any great volume just a background noise.
I was thinking about this on the drive back today and did notice one example of it. Probably just a matter of being conscious of it because of this discussion. I was driving up the x80 freeway (Everything down here is something-80, 280, 480, 580, etc) with the window down next to a lorry at 60 MPH and noticed that yes, it was painfully loud. So, it may happen more than i realize and I'm just not paying attention.
