Hi @hermsenk I did a little poking around and found some information about watch monitors for epilepsy. Please note that I have no experience with any of these products.
Embrace by Empatica is the world's first smart watch to be cleared by FDA for people with epilepsy https://www.prnewswire.com/news-releases/embrace-by-empatica-is-the-worlds-first-smart-watch-to-be-cleared-by-fda-for-use-in-neurology-300593398.html Price $249 https://www.empatica.com/store/

The Epilepsy Foundation wrote an Update about the Smart-Watch https://www.epilepsy.com/make-difference/research-and-new-therapies/innovation/epilepsy-therapy-project/new-therapies-2 Exploring the Smart Watch website I found prices range from $199 to $350 https://smart-monitor.com/order-now-form/#

This article compares 3 different devices: Smart-Watch, SAMi and EmFit, including pricing http://www.bcepilepsy.com/blog/seizure-detecting-devices Note that the article is dated 2015, so prices and features have likely changed, but it gives you a starting point.