You can do a reef tank under a grand for sure.
Drill a hole costs $40, get an overflow box for $100.
Pick up a protein skimmer for $250 and a return pump for $100.
This is all new, if you go used even cheaper. That is all you need to get started plus a bucket of salt $80 and then LR
100lbs or so will cost $300-$400 new or go on kijiji and get it for $2 lbs.
will be your major expense.. one your tank is all drilled filled with water and sand and LR
and is cycled, then you can worry about lights. Ligths will run you roughly $500-$800 for T5 HO
. for a 150 you will need at least 48 inch 8 bulb fixture. You can order Tek light fixture online for $400 then get your bulbs.
So yes it will cost you roughly a grand but it will be well worth it. And you dont have to buy it all at once either.