I feel there are two types of getting in. I set up QT and meds for under 150 bucks. My first tank was used for $150 65 gallon. 2 black box lights for a 100 each and HOB.
Then I upgraded and spent 3200 on a 90 gallon rimless tank and probably have spent close to 10k in all but if your just trying to get in cost can be affordable. Till you catch the bug. I did sell about $500 in mushrooms though.
Now my girlfriend makes fun of me because I had a 16 year old show up to our house to buy shrooms from me.