This is what I have in my 14g BioCube
75w Heater-13$
Penguin PowerFilter-30$
T5 2ft 4 Bulb fixture w/bulbs-$120
Hydor Circulation Pump-27$
Salt..really depends on brand and bulk I do ReefCrystals 200gal-50$
+w/e you want to spend on LR/Sand/Tank-70$ or so best guess
This should be a start but keep in mind most would consider this to be a TERRIBLE setup absolute bare bones. Do water changes often if you decide to go this route...often being 30% or more once a week IME.
I have a biocube with this stuff but I added filter floss which I change every other day and a corallife skimmer. Tanks been running for 6months no issues 3 Damsels, 1 Pepermint Shrimp. I feed 2x a day some small food. Coral in the tank is limited to some Zoas, Star Poly and a Xenia tree oh and I just added a mushroom coral...all super hardy corals IME.
Good luck and there are WAY better setups this is just the tightest budget fix I could think of.