I think some of your draft equipment estimates are a little low...brand new CO2 tanks come empty, filling it is around $20, and regulators around $70 for a single body. Of course if you can find it all used, then that's even better. I bought a kegerator that came with a tank and regulator, but I didn't trust the regulator in the condition it was in and bought a new one anyway (high pressure is risky business).Used ball-lock kegs are $39, a 5-lb CO2 tank, filled, is about $80, regulator for same about $40 (can vary: Try for a 2-gauge type, with a knob to adjust instead of a screw), some picnic taps and some gas hose and connectors (Under $30 for all)...and that's about it. A used fridge is a perfect start, or a smaller (7 cu-ft) chest freezer (ideally used, new are under $250) with an Inkbird controller ($30) and you are good to go for quite a while.
@Brewer #195813 there's a good sale at keg connection right now where kegs are half off if you buy a regulator and accessories. There kegs are always solid.
Also if you're gonna keep posting on the forum (and I hope you do!) You might want to consider a more memorable user name. There's lots of brewer #'s on here