Where to Buy Keycaps
Modifier Key Keycaps
These are keycaps with all sort of icons on them.
You can find more at
Artistic 3D Keycaps
The artistic 3D ones are typically custom crafted, not mass produced.
They can be expensive, $30 per keycap or more.
You can also find them on ebay, massdrop, or via keycap trade from reddit or geekhack.
If you have a question, put $5 at patreon and message me.