artist newsletters - what do you use?

after discussing the dismal state of social media with other artist friends for the nth time, i’m finally seriously considering making a newsletter - even if it’s just so that folks can sign up to be notified when i’m doing a shop update! i highly doubt i’d send anything out with any regularity but i’d love to be able to reach people when i do have something to share (& not have to rely on an algorithm, ugh)

are there free (or very cheap) newsletter services anyone would recommend for this? i worked a job years ago where i was responsible for a newsletter & we used MailChimp, but that’s all the experience i have. mostly looking to hear from other artists but anyone who uses a service they like is welcome to chime in, thanks!