I'll admit that I've spent more on wool typewriter pads than common sense would allow. The first such pad that I bought was the Ace Typewriter branded pad that they sell there at the shop (here in Portland). A sentimental purchase that I was only too happy to make.
Also, whenever visiting Ace I really admired the vintage Felt-Tite pads that they have out in the shop (typically these are sitting under a number of their machines that are out on display). So when I found an online office supplies seller who had a batch of new old stock examples in varying sizes available, I picked up two of these in different sizes. They were still in like new condition and were being offered for less than what many new pads sell for. The nice thing about the Felt-Tite pads is that they have a layer of rubber on the bottom that is fused to the wool layer. I see that there are some pads out there being made today still using this approach.
I definitely like typing with a pad underneath the typewriter. But had I not found the pads mentioned above, I'm sure that I would have been plenty happy with numerous other solutions that I've seen others come up with.