soy (in the form of edamame, tofu, and natto) is probably the cheapest option. Eggs are usually next on the list for people over here.
Edit: seafood might or might not be an option before eggs depending upon where one lives. Organ meat as well as we eat heart, liver, etc. a lot here as well.
Work has me using my current phone for alerts on my on-call rotation. I asked them to send me a pager instead if I can’t properly filter the alerts (Jira on Android has at least 2 sets of notification settings and then there are settings apparently within Jira. I was getting basically every Jira, Confluence, etc. message).