This is a new product for 2020 and it's being introduced exclusively on Drop.com. From talking to people (often at the keyboard meetups, big "Hi" to everyone I've met) this is the most requested combo - all clicky switches, but a variety. The combo of blue, green, and navy switches makes it both a fun fidget and a useful switch tester. And having them paired on opposite sides gives a solid, consistent feel.
Also, it doesn't make this explicit in the description, but it's important to note: this CLICKEYbits is one of the "finished products", not a "DIY" product. That means the switches are not removable. There are other drops for those who want to be able to change out the switches.
Lastly, I know the "Ship By" date is officially Jan 6th but I'm going to do all I can to make these get out the door right away. I can't make it a promise, Jan 6th is the official date, but a rapid turn-around for a pre-Christmas arrival (at least for US destinations) is my goal.