To keep it simple, you could get a light like
this (make sure it has freshwater bulbs), buy and mix your own ferts from
here and spend about $30 for WELL over a year or twos supply of macronutrients, get some API root tabs (or put down some ecocomplete under your stand) and Seachem Flourish for micros if you don't want to become a chemist in your spare time, and buy plants
here and depending on how many plants you get, spend less than $150 to get completely set up.
My words to the wise are
A) if you get a light like that that doesnt have legs to prop it up, hot glue something to each of the edges to raise it off the glass a bit. I had one of those fixtures and it actually worked great at exactly 1wpg, however the plastic / acrylic shield melted and popped a bulb. Now I have a better fixture, but no less, a $60 lesson
B) Dry ferts are EASY to mix. The main ones you need are Potassium nitrate (KNO3), Potassium sulfate (K2SO4), and Monopotassium phosphate (KH2PO4). I bought a pound of each for a total of $11. Shipping was $11.35 haha. PS you may end up being watched by the government. Ok just kidding, but you never know. . .Big brother is watching you
C) I've bought live plants from 3 places online, and that store is incredible. A+ service, A+++ plants. Good sized specimens, and she usually throws in a few extras too
I've found that it's best to just wait for others (like me) to screw up and learn from them. I've probably spent $250 on crap I didn't need in all of my experimenting, and that number may be a bit low even. . .