I like green tea (powered matcha has more caffeine than regular green tea), I guess you also have things like mate and energy drinks

Green tea, or just taking a (split) caffeine pill.

Black tea, however, contains considerable amounts of tannins which have similar psychoactive effects as the MAOIs in coffee.

If you really want to save money, Walmart brand Stay Awake caffeine pills are 80 200mg tablets for a few bucks. I split them in 4 so it is like 320 50mg servings for a few bucks.

The best thing about caffeine pills is you can actually know how much caffeine you are getting. I limit myself to 100-200mg a day. I wouldn't even want to know what I use to take drinking coffee but it was quite a bit. I will just drink coffee now as a treat.