I have been giving a lot of free seeds to coworkers. I don't worry as much about seeds being "easy", but instead stress that the person has nothing much to lose by trying to grow free seeds

No pressure, if they don't make it, they were extra. Most often, I give away seeds that I ultra prolific for me and easy to save. Majority of these are also easy to grow and, obviously, save seeds from. I am pleased to say a lot of people seem to be getting excited about gardening, including one person who I wouldn't expect (not taking credit for this, but hopefully I made some sort of difference). I do talk about gardening a lot, sometimes maybe too much.
My most commonly given away seeds are:
marigolds, basil, dill, cilantro, winter squash, beans (for those that want them, I only have pole varieties, different species), okra, and radish. I also give away extra seeds that I don't want to grow - mainly ones not locally adapted or ones I don't want crossing for some reason (i.e. samples from companies).
It's pretty easy to save above seeds here in Western NC, but I would imagine your list may be a little different and based on what grows well in your region.