The only online one I use is https://www.headspace.com/. There’s lots of information on there, and also a free thing with ten 10 minute long meditations, which is a good introduction. I also happen to have some CDs that I got when I took part in a study into it that was funded by the MS Society.
I know what you mean about the being put off by the idea of noticing pain & not doing anything about it. When I started the study I did, I thought that sounded like torture. But the strange thing is, it does help. It took a bit of getting used to of course, but eventually it became easier, and I find my experience of the pain lessens now. I used to say I’m in pain, but actually that’s not true. It’s only a tiny bit of me that’s in pain. By being mindful of the whole of my body, I notice that almost all of my body is feeling different things other than pain. It’s a bit like looking at a map, and the pain is a feature on the map. Noticing the rest of my body is like zooming out of the map, and so the pain becomes smaller. Alternatively, I can zoom in on the map, and explore the pain. Then I notice that it’s not constant - it comes & goes, and has different feelings. Generally, if I’m wishing the pain in my leg would go away, I’m more likely to feel tortured by it. But if I’m able to give my leg permission to feel whatever it’s feeling, then it tends to ease off quicker (or at least, I don’t notice it so much).
Hope it helps : )