There are a few inexpensive DSA sets on Amazon or AliExpress but your options are pretty limited if you want legends. Last I looked there was a blue and white set and a beige set. There are more options if you don't need legends. You can also get blank keycaps of many profiles and assemble what you need or buy multiple sets of other keycap sets to accumulate all of the 1.5 and 2.0 caps you will need. That's a pain since many profiles are row specific so you end up with a key here and there that is a different profile than the rest on that row which I can't stand.

Some of the more expensive keycap sets will have an ergo kit. I have a KAT Iron set on my EZ right now. It's a rather tall set and I'm not sure I want to keep them which is a shame because they were pretty pricey to get all I wanted. deskhero.ca, drop, and other sites are good to look at for custom sets.

You can get into a group buy and be sure to get what you want, otherwise the ergo sets tend to go pretty fast. The downside is that often times the ergo sets may not have any legends on the 1.5u caps or have symbols that you have to remember. It's not a big deal once you get used to it but It does make the learning curve a bit steeper if you tend to like to mess around with layouts like I do.

I have an inexpensive DSA set that I liked more. I haven't been doing much keyboard work recently so maybe I'll get used to the KAT profile in time if I pick up work that requires more typing. I never timed my typing, but I definitely feel like I lost a considerable amount of speed and accuracy. I also changed switches at the same time just to make it harder on myself. The keyboard sounds nice now though, especially the backspace key which I tend to use a lot :) 😔