I'm on Social Security, so I can relate. (I hope to be off soon!) I buy a share of advertising for PSA's at the first of the month, and TCredits at the middle of the month. That way, my EA status is confirmed, I get new PSA's every month, and I have TC's to give away when my team earns the goals I have set for them. It costs $54 per month. It's a stretch, but it's working!
If you can't do rhat, then I would alternate between the two - PSA's one month, TCredits the next. Good luck!