So, someone already lost one of my presence tokens. 
I was able to find a close match at Gamecrafters -- they're a little thicker and slightly higher diameter, but they work well enough and are fairly inexpensive. Plus it let me pick up other colors I didn't have! 
Wanted to both point out this resource and see if anyone has found other sources that are a closer match?
Somebody had a Reddit post where they were mentioning someplace that let them get a full set of 12 colors. I'll see if I can dig it up tomorrow.
Thanks -- that's pretty awesome!
If you email contact@greaterthangames.com, Craig can likely help you out with replacement parts :)
https://www.printplaygames.com/product/15mm-wood-discs
Slightly thicker than the ones that come with the game, and these:
https://www.printplaygames.com/product/19mm-x-6mm-wood-discs
were used for the reminder tokens.
Thanks, Paul! 
Ooo… LOTS of color possibilities! 
I love some of the custom presence folks have posted on BGG, but that's a bit more work than I want to put into it! 
My dog managed to attack several pieces just after getting this game. If I’m reading the replacement page correctly it’s $0.95/piece? Was hoping I’m mistaken as 12 pieces would cost $11.40 to replace :-\
Send an email to contact@greaterthangames.com and I bet you can work something out with Craig :)
He just redirected me to the replacement parts page. :-\